Citizen Kane is definitely the greatest, no one so far can pass over its height. I think the best film in recent years is United 93, and I also love Eternal Sunshine of the Spotless Mind (2004) very much. This is my list:

1. Citizen Kane (1941)
2. The Godfather (1972)
3. Casablanca (1943)
4. Chinatown (1974)
5. Gone With the Wind (1939)
6. Schindler’s List (1993)
7. It’s a Wonderful Life (1946)
8. Lawrence of Arabia (1962)
9. Psycho (1960)
10. Sing’in in the Rain (1952)
11. Raging Bull (1980)
12. 2001: A Space Odyssey (1968)
13. Some Like It Hot (1959)
14. The Godfather: Part II (1974)
15. Sunset Blvd. (1950)
16. On the Waterfront (1954)
17. All About Eve (1950)
18. Star Wars (1977)
19. Grapes of Wrath (1940)
20. United 93 (2006)
21. Eternal Sunshine of the Spotless Mind (2004)
22. Vertigo (1958)
23. To Kill a Mockingbird (1962)
24. Wizard of Oz (1939)
25. Double Indemnity (1944)