1. The Exorcist (one of the finest and most effective horror films I can think of, even if not my personal favorite).
2. Let's Scare Jessica to Death (I love so much horror cinima from the 1970s, and this move scared me badly as a kid. It still I think works on different levels, and the entire vampire genre is sort of boring to me compared to other monsters).
3. Freaks. (Browning as director. Amazing film).
4. Eraserhead.
5. House on Haunted Hill (the remake by Lionsgate. I know it is not the finest example, but it is a total guilty pleasure, and I love the performance by Geoffrey Rush. The insane asylum set is so cool, too).
6. Night of the Living Dead, Dawn of the Dead, Day of the Dead, and I almost hate to admit, Diary of the Dead (who doesnt love George Romero, though his last few have been pretty aweful. He is the master of a genre he pretty much invented. Some of the remakes have been pretty bad, but most have some fun stuff in them)
7. Finally, the AMC series The Walking Dead. I just can't say enough about this program, and just saw the trailer for season 3. I can't wait!