West Side Story
This movie rules, it always has. The music is incredible, the dancing is awesome (check out the "Cool" dance sequence . . . very neato), and it gives such a powerful message, driving it home. This is one of the very few movies I have cried in, thus making it an amazing story. The original Shakespeare story wasn't nearly this ruling.
(In case you're wondering, the other movies were A Walk to Remember, Savannah Smiles, Casablanca, and Monsters Inc.)