I too have read a lot of horror, but rarely anything that really scared me.
Stephen King has done it once or twice, somewhat. I havent read Pet Semetary but I hear its pretty strong stuff.
I love IT to dearly for it to ever really scare me.
I once read a story, I think it may have been by Robert Bloch, and its title had something to do with a house...it was a ghost story, and the ghost acted via mirrors. It had me almost incapacitated for a couple of days.
I'd tend to suggest going out and getting a couple of good horror anthologies, since I also agree with whats been said that short horror stories often have more actual fear-punch.
Song of Kali has I believe been reprinted...I saw it in a borders some ways back. I may just have to check that out myself..