There are some very nice lists here.
I mainly prefer more contemporary stuff (even those that are period films).
1. Lost in Translation (Coppola, 2003)
2. In the Mood for Love (Kar-Wai, 2000)
2. Donnie Darko (Kelly, 2001)
4. American Beauty (Mendes, 1999)
5. Amelie (Jeunet, 2001)
6. Pulp Fiction (Tarantino, 1994)
7. Magnolia (Anderson, 1999)
8. Spirited Away (Miyazaki, 2002)
9. Fight Club (Fincher, 1999)
10. Lock, Stock and Two Smoking Barrels (Ritchie, 1998)
The runners up are from the likes of Princess Mononoke, Eternal Sunshine of the Spotless Mind, The Godfather, Talk to Her, Adaptation, The Third Man and (i'm not sure if this counts) the Band of Brothers mini-series.