Alright thanks! I think I have a good pinion selection for the 14:1-17:1 range if I go with a Revo-style slipperential, which is probably going to be my route.

I now have another question (which is somewhat unrelated), but does anyone know if Brushless setups have regenerative braking like Hybrid cars do? Reason I'm wondering is because I'm thinking of using mechanical brakes for the bias (and to have less strain on the motor/esc), but if there would be a noticable decrease in runtime, I'd veto it. I'm assuming that regenerative braking hs something to do with mechnical brkes on a hybrid car, and wouldn't be applied to this scale of a system, but just wondering.

Also, how many amps does a normal radio setup pull? By "normal" I mean dual steering servos and a reciever. And if I use an external BEC, wouldn't it put a bit more strain on the batteries than if I used a seperate reciever pack? (might seem random, I know, but I just want to know if I should get an external BEC or not, rather use a reciever pack if there is a difference).