List your favorite Vs. matches

Alright, in response to Game Informer's Top 10 fighting game characters list that made little sense... let's make a list that makes a little more sense.

What two characters do you love to pit against each other? Perhaps it matters which of your friends is playing that character... or two friends playing each other... or just an evenly balanced match.

I've always wondered what it'd be like to fight myself. I mean, I know I'd win, so I guess its kinda anticlimactic, but still...