E-maxx 3906 Twin HV4400, 14cell 4200mAh

[suicideneil]

There are a couple maxxes and revos with center diffs fitted, or being fitted, but unless you can make your own its a difficult route to follow:

V2 slipperential

FLM chassis center diff unit

MaxxBling

I would stick with an upgraded 3906 tranny really. For a motor, either a neu 1515 item, or lehner 1950, maybe even hacker C50XL, depends on your budget really. Seeing as you have enough A123 cells for 7s2p I think, the MMM would be fine (wait for 2nd gen to arrive in a few weeks time), or wait for the tekin Rx8 to arrive. You wont be short on power at anyrate...