Mamba + Rustler = Which?

My batteries are great for nimh, I have 4 sets of zapped and matched 7 cell ib4200's from SPC (love them) and 2 sets of gp3300's non matched (use for test/tune runs).

I've decided on a 7700 for now. When I move to a larger place (hopefully in a year or so) and go lipo I'll pick up a 5700.

The 7700 will see some dirt, probably in the 10% of it's duty and I'll just gear down a bit for dirt, 13/90 or 15/90. For street i'm planing on starting at 17/86 and see where temps take me from there. I have 13-18, 21, 23 and 28t pinions and 76, 83, 86, and 90t spurs to play with.

Thanks for your input everyone!