These are all my personal favourites, with personal ratings. I've yet to see Donnie Darko, but I have a feeling I'll absolutely love it.
The Shawshank Redemption 10/10
Memento 9.5/10
Fight Club 9.5/10
Requiem for a Dream 9/10
The Pianist 9/10
Lord of the Rings: The Fellowship of the Ring 9/10
Lord of the Rings: The Two Towers 8.5/10
The Green Mile 9/10
Gattaca 8.5/10
Pulp Fiction 8.5/10
Resovoir Dogs 8/10
The Royal Tenebaums 7.5/10
Saving Private Ryan 8.5/10
Groundhog Day 8/10
Se7en 8/10
American History X 8.5/10
American Beauty 9/10
Catch Me If You Can 8.5/10
Back to the Future 1 8/10
Back to the Future 2 8.5/10
Back to the Future 3 8/10
Terminator 2 8/10
Almost Famous 7.5/10
The Truman Show 8.5/10
The Usual Suspects 7.5/10
Being John Malkovich 8/10
Addams Family 8/10
Addams Family Values 8/10
Monty Python and the Holy Grail 8/10
High Fidelity 8/10
The Professional 8/10
Forrest Gump 8/10
Willy Wonka and the Chocolate Factory 7.5/10
The Matrix 8.5/10
Twelve Monkeys 8/10
Gladiator 8/10
Star Wars: A New Hope 8/10
Star Wars: The Empire Strikes Back 9/10
Star Wars: Return of the Jedi 8/10
Star Wars: Attack of the Clones 8/10
Star Wars: The Phantom Menace 7/10
The Sixth Sense 8/10
Insomnia 7.5/10
Road to Perdition 8/10
Minority Report 8/10
X-men 7.5/10
The Ring 8/10
Sleepy Hollow 8/10
Trainsporting 8/10
Amelie: 8.5/10
Akira: 8/10
L.A. Confidential 7.5/10
The Fifth Element 7.5/10
Jurassic Park 8.5/10
The Lost World 8/10
Taxi Driver 7.5/10
Dumb and Dumber 7.5/10
Braveheart 8/10
Silence of the Lambs 8/10
Nightmare Before Christmas 8/10
The Insider 8.5/10
Robin Hood: Men In Tights 7.5/10
Ace Ventura: Pet Detective 7.5/10
Ferris Bueller's Day Off 8/10
Bowfinger 8/10
Harry Potter and the Philosopher's Stone 8/10
Harry Potter and the Chamber of Secrets 8/10
Jackass 7/10
One Flew Over the Cuckoo's Nest 7.5/10
Mildred Pierce 8/10
Artficial Intelligence 8/10
Cabinet of Doctor Calligari (As entertainment: 7/10, As an artwork and historic POV: 9/10)