Oh snap, totally forgot Guilty Gear. XX Accent Core is easily the most balanced fighting game currently out there. Mechanically, it's a better game than KoF XIII, but I prefer SNK's sprite work so KoF just barely gets the edge. Anyway, the Wii version is pretty rare nowadays, but it's being released on PSN/XBLA this summer so you should definitely check it out.
Speaking of Guilty Gear, Arc System's Arcana Hearts 3 is a fantastic game as well. I wouldn't blame you if the character designs turned you off (I'm not a fan either), but the combat system is exceptional.
Incidentally, Persona 4 Arena, yet another Arc fighter is being released in August. Not a fan of the RPG series, but Arena looks like a solid game. Keep in mind, however, all these games are some of the most complicated entries in the genre so be prepared for a steep learning curve.