Oooof! That's a long list!
You could, however, do much worse than checking out various books from the following:
http://en.wikipedia.org/wiki/Ballantine_Adult_Fantasy_series
Newcastle Forgotten Fantasy Library - Wikipedia, the free encyclopedia
There are also such writers as Harlan Ellison, Ray Bradbury, Charles Beaumont, Richard Matheson, Rod Serling, etc., who are frequently classed (rather loosely, by any definition) as sf writers, but who have themselves noted they were more
fantaisistes. And then there are other writers, such as Donald Wandrei (at least, at his best, which is still a substantial amount), whose fantasy is more of the nightmarish kind.
"The Howling Man" was a story by Charles Beaumont, originally published in (of all places)
Playboy, then adapted as an episode of The Twilight Zone; and deals with a traveler who comes upon a strange monastery with an even stranger "guest" (read: prisoner), whose howls will not let him have peace until he finds out who this person is and why he is imprisoned...
Also, such writers as Roger Zelazny, Tanith Lee, C. J. Cherryh, Andre Norton (at least with her earlier Witch World books), Avram Davidson, etc., are also worth reading. And these only begin to scratch the surface....