Errol Flynn vs. Basil Rathbone in "The Adventures of Robin Hood". For sheer *********, I love Bruce Willis vs. Alexander Gudinov in the first "Die Hard".
Kind of depends on what mood I'm in, though. The light saber fights have just lost their luster for me, despite the fact that they became more technically exciting, they just lack the emotion that earlier ones had. That fight in "Empire Strikes Back" between Luke and Vader may not be as well-choreographed as the Maul-Jinn-Kenobi fight, but come on...
"No... I am your ******"
And I think that last fight with Kenobi and Anakin was atrocious. All flash and nothing underneath it. And then to end with something as silly as "hey... I have the high ground." What? When was that ever mentioned as some undeafeatable Jedi trick? That, and when you already know the outcome, it's hard to get that whooped up about it.
H