I highly recommend virtually anything by H.P. Lovecraft. One interesting facet of that whole experiences is that it comes out in his "voice" as you read, what an extremely weird individual he was. Maybe one day a movie will be made from one of his works that doesn't suck.
Oh Swp... you have fantastic taste in literature. Oh and I heard they're making Call of Cthulu into a movie... but then I saw the trailer and don't want to see it.
Glad to know there's another horror buff in here.
(ever read Neil Gaiman? not necessarily horror, but definitely fantastical)