As AMAZING as MOST of those films are, it's also just as AMAZING that MOST of those films had mediocre/lackluster climatic final fights. Fighting scenes during the course of those movies were better than the climatic fight themselves.
But to pick the best final fight, i'd have to go with...........Blade vs Nomak. It was fast and brutal. The part where Nomak swings Blade and his head clips the stone pillar....OUCH.
Next up i'd probably have to go with the Wolvie vs Deathstrike fight. As you are watching X2, that is a fight that you are anticipate to see, something that the Wolvie vs Sabretooth fight didn't live up to. And the unedited version (although a few more shots) of the fight makes it a little bit better IMO.
But the best overall and most memorable fight to me is the Spidey/Doc Ock train fight. It owns the climatic fight with Ock and any other comic book fight PERIOD. I also like the Hulk vs Hulk Dogs fight, also upstaging the climatic fight with pops.
Oh yeah, you forgot to include the DD vs Kingpin final fight also.