This is tough!!! I can't name absolute favorites, but at the moment...
North By Northwest / Notorious (I'm not sure which I like best)
Mr. Smith Goes to Washington
A Philadelphia Story
Lola Rennt (Run Lola Run)
Edward Scissorhands or Hamlet (Kenneth Branagh's adaptation) or The Great Dictator (Charlie Chaplin)
I also really love Moulin Rouge, Eternal Sunshine, Rebecca, Ghost & Mrs. Muir, My Fair Lady, LOTR Trilogy (Esp. FotR, RotK), Amadeus, Harry Potter & the PoA, Ferris Bueller, Signs, Gladiator, It Happened One Night, Braveheart, Rear Window, Finding Neverland, Vertigo, Spellbound, La Vite e Belle (Life is Beautiful), Chocolat, Ameile, Goodbye, Lenin!, Big Fish, My Favorite Wife, Back to the Future (any), Indiana Jones (any), Cinderella, Sleeping Beauty, Lion King, English Patient, Schindler's List, Gone With the Wind, Casblanca, Dr. Strangelove, It's a Wonderful Life, Silence of the Lambs, Red Dragon, To Kill A Mockingbird, Roman Holiday, Bourne Identity, Monty Python and the Holy Grail, American Beauty, LA Confidential, Der Untergang, Incredibles, Monsters Inc, Finding Nemo, Toy Story I, II...
Wow - overboard. Ok, I have to stop... let's just say I love movies, haha...