Card Fighters Clash will suck your life from you and never give it back. One of the few games of the thousands I've played that I've broke a triple digit hour mark in. 106 hours total. If you have someone to play against, that's what happens.
There's really not a bad fighting game for the console (actually, not many bad ones at all in general for the system). You have the best one, so some may feel like a small comedown, but rest assured you'll have fun with all of them. Gals Fighters is great.
If you have a small interest in golf at all, Neo Turf Masters got a great translation.
Cotton provides some great shooting action.
Baseball Stars is great too, though the Japanese baseball game whose name I forgot is better.
Big Bang Pro wrestling is a blast too. Tons of technique for a two button console.
Mega Man can be found for a price, a translation of the two arcade fighters. It's not a great game to begin with, but the port is impressive.