#1 - Revenge of the Sith - For all its issues and problems (and boy does it have problems and issues), this is still my favorite Star Wars film. The emotional journey of the film is something that I really enjoy. Obi-Wan's world-shattering, "I'm so sorry," where he seems to be apologizing for so many things all at once, is (to me at least) just gripping. Admittedly, my enjoyment is almost purely irrational -- it's almost impossible to defend the film from the many valid criticisms.
#2 - The Empire Strikes Back - For all the reasons people usually for why this is the best Star Wars film. It really is the best Star Wars film in terms of story, character development, production, dialogue, and so forth. Plus, it's one hell of a ride.