One thing about the NuKirk bar fight was that right before it, when he was flirting (and failing) with Uhura, he made a silly face that was really (I mean REALLY) reminiscent of Shatner. The man did his homework.
For fisticuffs, NuSulu and Sulu Prime take it for me, but I could be biased of course. And as classic as the fight in Trouble with Tribbles is, the Trials and Tribbleations fight takes it for me because of the juxtaposition of styles.
There's also the Hayes Vs. Reed fight. You could cut the tension with a Borg laser beam.
Lastly, for some odd reason, there's a soft spot in my heart for Admiral Quinn beating the snot out of Riker left and right. I have no beef with Riker whatsoever, it was just funny to watch (Jonathan Frakes really loves his legs, apparently -- whether it's doing some sweet kicks, or leaning on Data's console, or walking over a chair to sit on it, he loves his legs).