For me, personality overrides everything. No, really. Anyone who scanned through the pr0n collections on my PCs (and CD-Rs, DVD-Rs, etc.) would see that. The only thing that they all have in common, is a flash of merriment in their eyes. If a woman doesn’t have that, I’m not interested.
As zweisamkeit said, the two are not identical. To me, a pear/guitar is definitely not proportioned the same on top as on bottom. An hourglass, other hand, is.
[sub]Vase-shaped, on the other hand, given the wide spectrum of vase shapes, is far too inexact.[/sub]
There is that too, but as it isn’t a build characteristic, I left it out.
I spend 7 days a week in a gym and lift weights 3 of those days, and have done so for over 12 years without a break. I’ve seen enough muscular women in my time, that’s one big turn off for me, any woman with muscles comparable to mine is way too built. I know it’s sort of a double standard, a guy get’s buff and lots of women are attracted to him, but not me.
I think women should be “soft” not hard.
Other than the no-bodybuilder women extremely skinny is also a big turn off.
Extremely fat is a big turn off.
Then once you get out of those extremes I can think of women of all body types in between that have been attractive. I think certain women carry weight better, and can look attractive “heavy.” While some women can pull off the very skinny look. It’s weird, and hard to explain. Basically I think a woman’s overall body needs to “click.”
Like, compare two women with the exact same measurements, one might look too skinny to me while the other looks just right. Some people just look “more natural” at certain sizes I guess, I dunno.
Two more random thoughts on preferences:
Librarians: Put horn-rims and a severe skirt on just about any woman and it increases the hotness coefficient by a good percentage ('specially thin girls.) One of my favorite bartenders in Milwaukee (at Landmark Lanes) used to be colloquially known among my mates as the “Librarian in Leather” for her combination of a leather, um, catsuit, I guess you’d call it, and really out of style glasses. I can’t for the life of me remember her name right now, but she was 'ot…but not quite so much without the glasses. (Still rather pretty, but not so you’d notice her in a crowd of co-eds.)
Irish Girls: Red hair and freckles is the easy sell, any day. The ex-girlfriend was the prototypcial Irish girl (with some German background): Freckles, strawberry blonde, blue eyes–she was a thump-skip-thump. It didn’t hurt that she had the rest of the package, too: Monty Python quotes, a signed Douglas Adams book, a poster of Pluto in her bathroom autographed by Clyde Tombaugh, degrees from MIT and U Michigan, and a film geek. I knew the day she started talking about nucleation points in her beer that she was a keeper, but I guess the feeling wasn’t mutual.
Damn, I miss that girl. There may be others, but not like her.
Stranger
Curves. Gotta have the curves. They keep a man warm at night. Medium breasts, and a nice curvy bum. Fairly well-toned muscles - think cyclist, not body-builder. Long hair is a plus, but definitely over shoulder-length, and preferably thick. Little or no makeup. And brains. Gotta have the brains. Reader, I married her.
dark, curly hair, dark eyes… height doesn’t matter, but i tend towards shorter girls, even though i’m over 6’. not skinny. i want a girl with some meat on her, she has to be a little soft. i’d have to go for medium sized breasts, c’s are too big for me. well, maybe a c. a nice ass to grab onto. that’s imperative. no flat asses. hmmmm, legs… yeah, nice calves. that about does it for me.
Oh hell. Girls, we are not going to get to have **Case Sensitive’s ** babies. sob
GENERAL: the overall impression of the ideal woman would be a colorful female with a distinctly ticked coat, medium in size and regal in appearance. The woman should be lithe, hard and muscular, showing eager activity and a lively interest in all surroundings. Well balanced temperamentally and physically with all elements in proportion.
HEAD: a modified, slightly rounded wedge without flat planes; the brow, cheek, and profile lines all showing a gentle contour. A slight rise from the bridge of the nose to the forehead, which should be of good size, with width between the ears and flowing into the arched neck without a break.
MOUTH: not sharply pointed or square. The chin should be neither receding nor protruding.
EARS: alert, large, and moderately pointed; broad, and cupped at base and set as though listening.
EYES: almond shaped, large, brilliant, and expressive. Neither round nor oriental. Eyes accentuated by fine dark line, encircled by light colored area.
BODY: medium long, lithe and graceful, but showing well developed muscular strength without coarseness. Ideal female conformation strikes a medium between the extremes of the cobby and the svelte type. Proportion and general balance more to be desired than mere size.
LEGS and FEET: proportionately slim, fine boned. The woman should stand well off the ground giving the impression of being on tip toe. Feet small, oval, and compact. Toes: five in front and four behind.
TAIL: thick at base, fairly long and tapering.
She sounds a bit of a bitch to me 
Redheads, surfer girls, curves, batshit crazy rocker chicks, free spirits…If women were flowers, I’d go for the daisies and sunflowers rather than the roses and lillies.
I grew up around very tough and active women, so a swimmer’s build has always done it for me. However, I like to have a few curves on the racetrack.
I’m not really picky, but given a choice, I’ll go for the bigger woman every time. Too heavy is much preferable to too skinny. That link buttonjockey308 posted of Kate Dillon almost made me fall out of my chair. So: big hips, large breasts, still possessing a waist, and nice curviness/softness all over.
And I got me one. 
I’m sure I won’t be the first to say that I don’t get involved with women based on what they look like. (I suppose I could filter from among those I click with and omit those whose morphology doesn’t totally send me…). Anyway, yeah, all other proverbial things being equal…
a) The area between navel and crotch, the lower abdomen, needs to be taut. Architecturally, a female bod should be retreating from you from the hipline down. And there should be a cute V shape formed by the leg creases, unobstructed by overhang. A great deal of otherwise plumpness is not a disincentive if the lower ab is tight.
b) I like small mams, ma’am. Some cute roundness can shape up a t-shirt and balance the hip-swell below, but large looks awkward and huge looks bovine.
c) Hairs. Girlhairs. Just say no to the razor. Not just “there”, everywhere. Along the neckline, long the forearm, down the legs, I like hairs there. And definitely “there”.
d) Freckles. Especially with red hair but also with dark brown or black hair. (Odd, now that I think of it, I don’t recall having any blonde freckled companions.) I dunno why, I just have this thing for freckles.
e) Kinda tall. What works really well is if I’ve got 3-5 inches on you, which puts you at 5’7" to 5’10". If you’re shorter, I get swayback and backache to keep from having my nose go up above your hairline and smothering you in a thin layer of chest hairs when we’re doing the connection thang, and if you’re taller I’m staring at your chin instead of into your eyes.
f) Wiry is better. I’m wiry so I’m not asking for what I don’t give, but I do like small but effective musculature, not the definition of bodybuilders with zero pecent bodyfat but there to the touch, narrow fibers but solid and when tensed like piano wires.
Boy. The rare thread where a guy can say this stuff and avoid a firefight. Cool.
I am deeply drawn to big women. Not just a big heavy. Big women. Thing 5 foot 10 to 6 foot tall and maybe 200-240. 
Perhaps along these lines or bigger. Rubens Nudes ( work safe, nude painting )
The discussions about eyes, smiles, faces, etc. are very important but it really did sound like the OP’er was asking about what body types we were drawn to as men. Eyes to die for and a smile and laugh to go with it takes me a long way down the path of serious love. Serious like. Serious lust.
Seriously.
Cartooniverse
Yes. I’m all for big women, personally. Curvy gets bonus points, as I tend to like rounded edges over sharp ones. Tall is nice, and I tend to assume that my height or shorter is ideal for that (6’ or below), but I’ve never really tested that theory with a lass taller than myself. Beyond that, it’s hard to say. I’m continually surprised by the body-types of the people I’m attracted to, when I stop to think about it. My taste in women tends to change with my level of interest in particular ones, I think
Oh, boobs are a must. I don’t have any real opinions on nipples or size, although the tendecy is between B/C and DD, so long as they are pretty. I know for certain that I’m attracted to a lady when I notice her breasticles.
Beyond that, as trite as it may sound, I really do go for personality more than anything else. Strong women, the weird ones, those who are a little bit nuts, the confident, independant ones, and those with whom one can hold a pleasant conversation are the ones who tend to hold my attention.
bamf
Anything from “waif” (as a previous poster or two mentioned) to quite large. As long as large isn’t so large that she is apparently struggling when she walks on a flat surface. What really seems to matter within this range is whether she seems to be projecting sexy or approachable. Either is nice.
Boobs can get -too- big. Proportional or even downright small is just fine.
Legs that gently taper off toward the ankle, without a bulky bulging weightlifter/body-builder calf. If the woman works out a lot, that’s fine, but she should remember to stretch the calf muscle, IMO.
A real grabber — though not technically part of a “build” — a twinkle in the eye that seems to say “I’m smart and sassy. Playful” .
A well defined waist with womanly hips, complimented by a generous bust.
Shape rather than size…mmmmm, those lovely lines made by breasts as a woman leans forward…completed by the wonderful topography caused by the rise of the hip from the waist as she lies on her side…
Sorta sounds like one of those labels ya read on a wine bottle! And just as intoxicating…
I’m gonna sound really cheesy saying this but my current girlfriend is pretty damn close to my perfect woman, physically.
5’5, 112, great legs, full lips, nice tanned skin. She’s half black, half irish so she has that look exoticness that comes with many mixed raced women. I don’t think i can really ask for anything more.