My list:
1. Rear Window
2. Psycho
3. The Birds
4. Night of the Living Dead (the only one of the "Dead" series I like)
5. Dial M for Murder
6. Dracula (the one starring Lugosi)
7. House on Haunted Hill (the original version with the one and only Vincent Price, the remake sucks)
8. The Mummy (the original, the 90s remake and its sequel is more of an adventure movie)
9. Man Hunt
10. Silence of the Lambs
11. Jaws
12. Carrie
13. Alien
13. Aliens
14. The Fog
15. The Howling
16. Poltergeist
17. The Thing (original and remake)
18. The Evil Dead
10. Evil dead 2: Dead By Dawn (the last two are guilty pleasures for the camp factor, and Bruce Campbell's hilarious performance, "Army of Darkness" is more a farsical epic, so it won't be on this list)
11. Friday the 13th (the original only, for people of the modern generation who are so used to Jason being the killer, having it his mom is almost like a great plot twist

)
12. Halloween
13. A Nightmare of Elm Street (the original only)
14. Wes Craven's New Nightmare
15. Children of the Corn
16. Gremlins
17. Scream (the original only, the other two suck)
18. Predator
19. Tremors (Kevin bacon doing what he does best!

)
20. The Shining (TV movie remake, the one that didn't butcher King's material)
21. The Faculty (a poor man's "The Thing", but still fun)
22. Disturbia (the only horro/thriller of the 2000s that's actually frightening)