That's the same setup that I have, and it works very well for me. It's also about the least expensive too. If you can spare some dough, a Neu motor, or Tekno's when they come out, would be better. Also, I think TrueRC is outta stock of the 5000's, and they don't quite fit the tray, a little too long. I just put some foam under them and it was fine. A better battery from True would be the 6400 4S2P or the 8000 4S2P. They can handle the amps better but also their dimension's are smaller length and width wise because they are made out of 3200 and 4000 cells, respectively. And they're not that much more, and the weight wouldn't matter because right now my Revo is little heavier on the motor side.
Everything else sounds good, although the MMM might be out by then, and their ESC/motor combo might be a good price, so I'd wait a little while before you buy anything, you won't even have the conversion for over a month!
Good luck!