I like:

- Psycho (the original, 1960)
- Psycho II (the others were pretty lame, but I thought this sequel was pretty enjoyable)
- American Psycho (although technically a drama, I love its horror aspects)
- The other Lecter movies like The Silence of the Lambs (my favorite horror movie), Manhunter, Red Dragon, and Hannibal
- The Omen (the original)
- Jaws
- The Texas Chain Saw Massacre (original)
- Storm of the Century (Stephen King mini-series)
- Needful Things
- The Shining (original, 1980)
- The Thing (re-make, 1981)
- Halloween (original, 1978)
- Friday the 13th
- Friday the 13th: Part II (only F13 sequel I like. Only decently made one, in my opinion)
- Dracula (1931) (Still great to watch)
- The Fog (original, 1980)
- The Devil's Advocate (also not technically a Horror movie, but great scary movie)
- The Others
- Sleepy Hollow
- Alien
- Aliens

That's about all I can think of right now.