Adding to what Sleazoid said, there’s a discussion on good MvC3 batteries here:
I would suggest watching the Wednesday night fight streams. Lots of good players (JWong, Marn, Mike Ross, Clockw0rk, Floe, etc.) and lots of footage.
Entirety of the first week’s tournament:
Entirety of the third week’s tournament:
Justin.tv - offcast - Videos
Start from the bottom at the 1:50:30 video.
And of course, you can see it live most Wednesday nights (sometimes they don’t/can’t stream, like for week 2).