DaRk. Oh man, let's not talk about that.
I've fought Kai, too, but it was 5AM in his country, and it was easy to tell he wasn't fighting for-serious, so that doesn't count.
Most fun fights are probably with Mccdbz, even though I totally > him. Hear that MCC?! Macho Man Randy Savage says IT'S ON!
...Actually, it's fun to fight with him because we're usually playing about the same, so it's like fighting in the mirror =D.
OT: There'll be aneurisms for everybody once you guys read my upcoming massive post in the suggestions forum. HUGE, omgloltoolongtoread in scale. It'll show up sometime tomorrow afternoon, just as a heads-up.