Ok Pam and Ike, I guess I threw you off with the horror. The clue was in my statement “Interesting that some of the best ‘horror’ is found in the Sci-fi genre.”
I was referring to Adventures in Time and Space edited by Healy and McComas. So many classics from the “Golden Age” of Sci-Fi! One look at the table of contents of this collection, and your jaw will drop. I don’t think a better collection exists. Maybe that is because this anthology was my first exposure to science fiction. It should be everybody’s.
I’ve cleaned out many an antiquarian bookstore (especially A. Amitin’s in downtown St. Louis) for golden age sci-fi anthologies. Looking at my shelf, I think I have them all. 
Back to horror. The Dark Descent is on my shelf, well read. Three other Hartwell collections (Shadows of Fear, Worlds of Fear, and Visions of Fear) are also on my shelf. I’ve read the first one. As far as the poll question goes, if The Dark Descent isn’t the best, I think it at least has the best representative samples of horror from the past 150 years. It’s not geared just to one era, which makes it more comprehensive and interesting to me.
Dark Forces is also really good, though a modern collection rather than trying to be representative of genre classics. As a collector of Stephen King first editions, I have this one because of the first appearance of King’s “The Mist.”
I have “The Graveyard Rats” collected in The Horror Hall of Fame, edited by Robert Silverberg and Matin Greenberg. This is a very good collection, with many stories already mentioned on this thread (“It,” “The Small Assassin,” “The Willows,”), and some other classics of the genre, such as “Smoke Ghost,” “Yours Truly, Jack the Ripper,” “Pigeons from Hell,” and “The Monkey’s Paw.”
I also have 2 Weird Tales Collections, each with about 50 stories. “The Graveyard Rats” is in one of these as well.
I think “Born of Man and Woman” was R. Campbell’s first published story. Believe it or not, I first read that in junior high in Read Magazine, put out by some scholastic service for classroom distribution. That journal was my first introduction to King (“Battleground” with the guy attacked by the toy soldiers), although it was several years later before I knew who King was.
Hmmm, now that I think of it, there were two other stories I recall from Read that I will need a little help with identifying. One was about a man chased by some futuristic killing device called a “Ruum.” Nothing special, but a nice little adventure.
The other struck me as a Bradbury(?) and was about a national examination day. The kicker was that if you did too well, you were deemed “too smart,” and, well, you didn’t want that to happen. The chilling part was the kid asking his parents the answers to very simple questions, and though they gave him the wrong information, they could see he was a bright kid and were very, very worried. A chilling look at how a future government could keep its citizens subjugated.
Holy cow, I remember another one! “The Imp”(?) which was a variation on the old sell-your-soul to the devil motif. Do these ring any bells with anyone? Bueller? Bueller?
I can’t even begin to imagine the outcry if today’s seventh graders brought stories home from school like these that the teachers passed out in class. I mean, you can’t even hardly say the word “gun” without getting suspended.
I’m not familiar with Dying of Fright, but I will be before too long.
I agree with that. Even though I’m not a big Ellison fan, I did like that one quite a bit.