I will make it a two-part question:
If you had to move away from the city/town/area where you currently live but could go anywhere else:
South Florida- Nice weather, good food, good people
Argentina- same, and really cheap “western” living conditions
That said, I’ve also had the opportunity to visit Salt Lake City a few times. I absolutely loved it. It was quiet, but at the same time, busy and active. It had an amazing charm of both “country” and “city” life. I think that, in the end, if it were up to me, I’d own property in both.
I live in Melbourne, Australia. Anywhere I moved to would have to be reasonably cosmopolitan. I need thousands of shopping and dining options, and city anonymity.
Sydney. By all accounts it’s not much different from Melbourne and I really love Melbourne.
London. My fiance and I have been talking about uprooting ourselves in a couple of years for him to follow greener career pastures. I like cold weather and the easy access to the rest of Europe is very appealing. We can take our cat over pretty easily, we have a fair few friends who are, or will be, in London, and the salaries in his industry are decent.
I’m from the states and my base is DC. I move countries every couple of years for work, but for permanent base:
San Diego or Seattle. Two kind of different places, but there are things I like about each of them.
Hrm. Sydney, Australia sounds good.
Dorset or Somerset. A nice bit of rural Britain outside commuter belts.
The NW corner of mainland America - Washington, Oregon, Montana. The land of the free - need I say more? The SW corner of Canada might do.
I live in Melbourne, Australia too, but unlike Kayeby, I would shun the cities and go bush…specifically the south coast of NSW, in a little town on a couple of acres overlooking the ocean (think Central Tilba or Narooma perhaps). I don’t much like shopping, but I do like chooks and views.
In terms of an overseas destination, I’ve always thought Alaska sounds rugged and remote enough to satisfy my isolationist tendencies. I might not be able to accomodate the poultry farm, but the scenery might well compensate for the lack.
In the States: I’d move to Chicago. Although I might have to winter elsewhere. Maybe Mexico, where I could hang out with family.
Out of country: I’d move to Germany; my best friend lives there and I already have quite a few friends there through her.
In the US, Seattle.
Overseas, UAE. (That’s why I am here).
Manchester - I’ve visited it a few times and it was fantastic. I can see why it’s considered England’s second city. As someone who never wants to live outside a city and really enjoys living in London, if I had to go somewhere else in the UK it would be there.
New York. Again, if I have to leave one world city I might as well trade up for another. Also a friend of mine is moving there soon so at least I’ll know someone there.
In the US: either the Triangle area of North Carolina (lived there in college and for 7 years afterward and it still feels like home in many ways), or Seattle (when Typo Knig got a postdoc in Washington DC I told him “WRONG WASHINGTON!!”).
Outside the US: Hm - I haven’t travelled outside the US aside from some brief visits to Canada (few days in Ottawa in high school, day jaunt to Waterton Lakes Park in the 80s, 4 days in Niagara Falls 2 years ago and that one surely doesn’t count). But offhand I’d think maybe somewhere in British Columbia - there’s that whole Pacific Northwest thing (see Seattle), and from everything I’ve heard it’s beautiful up there.
Hah, I am moving away! In May/June, it’s not fully settled where yet, but I know I’m getting the hell out of here! So…
90% chance it’ll be Nashville - born there, brother lives there now, always loved TN and I’m pretty excited about moving back. There’s about a 10% chance I’ll be moving to Long Island - not sure what town, but it’ll be either in Nassau or Suffolk county. The family I live with now is moving up there and they want me to go with them. I haven’t said no yet, but I’d really rather move to Nashville.
London - it’s the only place outside of the US I’ve ever visited (okay, there was that 22 hours we spent in Paris, but that was dreadful so it doesn’t count) and I loved every second of it.
Hawaii - it’s warm.
Costa Rica - it’s warm.
There’s noplace in the USA that I can even imagine living other than San Francisco. If I absolutely had to, I suppose Oakland would be barely tolerable, but that’s as far as I’d go from here. In a lot of ways this is the most liberated zone in the USA and it’s the only livable area for some of us weirdos .
Hmm, that’s a toughy. Amsterdam? Rio? Probably one of several cities in Mexico, which strikes me as being a much more live and let live, easygoing country than the USA; when I’ve been there the people have seemed more civil and tolerant and into minding their own business than the mass of Yanks appear capable of being(plus I really like the food and the booze and the climate down there, and good pot is nowhere near as dear as it is in California). I could see living in the DF, or Guanajuato or Oaxaca – or Veracruz, even though I’ve never visited there yet.
Can I opt to become a jet set gypsy, and make my home wherever I roam?
I considered answering SF for “another city” (I’m in SJ) but consider it kind of cheating. Oakland is in the same metro area so I call bullshit on your answer 
I’m fucking off to Darwin!
Second choice is Alice Springs, and I’ve never been there.
Well I AM moving – to Boston.
Internationally, I adore London and have lived in Germany and would be happy in either location.
Country Victoria.
Hong Kong.