I don't feel like making a personal list because it would require too much time to think about, but here's a good place to start:
http://www.imdb.com/chart/top?sort=ir,desc
Obviously I don't agree with the order of this list, and it's based primarily on popularity, but there is plenty of great shit on there.
The Kosis fleeting/ignorant/biased thoughts of the top 10:
1. The Shawshank Redemption (1994) Awesome. Best movie that's on TV constantly (along with Coming to America). Andy Dufresne is that dude. Goosebumps.
2. The Godfather (1972) Immaculate. Classic Drama. Nick Cage's uncle directed. See this and study this.
3. The Godfather: Part II (1974) Probably better than the first. Pacino shines. Pass on the third.
4. The Dark Knight (2008) Best comic book movie of all time. Ledger owns Joker and turns cartoonish into dramatic. Nolan did things.
5. Pulp Fiction (1994) Might be my favorite film of all time. Spot Kathy Griffin. Incredible story-telling. Fabienne wasn't supposed to knock over that lamp.
6. The Good, the Bad and the Ugly (1966) Clint Eastwood is a bad man. Used to impersonate this ish.
7. Schindler's List (1993) Powerful movie. Debbie Downer for approximately 400 minutes.
8. 12 Angry Men (1957) Meh.
9. The Lord of the Rings: The Return of the King (2003) If you love movies with 8 endings this is a must-see. Pass.
10. Fight Club (1999) Quite possibly the most overrated movie of all time. Eff this movie.