My choice is
The Shawshank Redemption.
I hope that it gets 3 +ve votes, so that it will be included as a poll choice. This movie got all of the aspects right. Excellent script by Stephen King, amazing direction by Frank Darabont, and some unbelievable acting by Tim Robbins. Anyone who don't like this movie must be mentally deranged.
I'm sure a movie like The Shawshank Redemption will get more than a few votes.
How many can we pick? Three that come to mind for me are:
American Beauty
Pulp Fiction
Snatch