I will probably try 6S 5000mAh Zippy. I think power peaks will be above 2kW :D
That will be perfect combination for Revo or Maxx.
Try to calculate optimal gearing with Parameter Solver:
http://scriptasylum.com/rc_speed/_solver.html
This is very useful tool.
> HB L2PE + MMM + Medusa 60-1600 @ 6S A123
> HB LSP + MMM + Medusa 70-1600 @ 6S2P A123
> AE B44 + MM + Medusa 50-3300 @ 4S A123
> AE J82 + SW 5700 @ 2S LiPo
> AE TC5R + MM 6900 @ 2S LiPo