I consider the original Star Wars and the 6 part saga to be two separate movies. Star Wars floats around my top 3 and the Saga is further down in my top 100.
In my Star Wars, Vader killed Luke's father, the Jedi aren't so dogmatic, Palpatine was just a politician, Tarkin was the master mind behind the Death Star, Han paid off Jabba right after the credits rolled, the senate was able to come back to power with Tarkin gone and the Empire's only bargaining chip, the Death Star, destroyed, and Luke and Leia live happily ever after because they aren't brother and sister.
Other than Star Wars, favorites include, in no real order:
-The Back to the Future Trilogy
-Kill Bill Vol 1 &2
-Army of Darkness (cut varies)
-Raiders of the Lost Ark
-Metropolis
-Superman 1 & 2 (Mankiewicz script version that pretty much exists only in my head with the existing movies only serving as a visual reference to what could have been).
-Gran Torino
-The Outlaw Josey Wales
-Dawn of the Dead (1978, cut varies)
-The Life Aquatic with Steve Zissou
-Lost in Translation
-Pleasantville
-The Matrix
-Brazil
-Scott Pilgrim vs the World
-Kick Ass
-Battle Royale
-Captain Blood
-The Exorcist
-Hot Fuzz
-Independence Day
-Total Recall
-The Day the Earth Stood Still
-Ed Wood
-Jaws
-Avatar
-Fight Club
-Fright Night
-Mr Smith Goes to Washington
-The Shawshank Redemption
-American Beauty