Evil Dead 1&2, Army of Darkness are some of my favorite movies growing up. Just rewatched The Howling and it was good but not as good a American Werewolf in London. Friday the 13th and the Hellrazor series were awesome. Lost boys etc. The Gate. Pet Cemetery, Sometimes They Come Back and Cats Eye I thought were great Stephen King adaptations. I really enjoyed The Cube for its creativity and small set.
Still its the SciFi horrors get me the most. Alien series was awesome and Event Horizon were awesome. Something about having nowhere to escape to I think.