The current plan is to put a 10XL in it with a 5S LiPo. I've got everything I need to get it in there, except for the pinion for the motor, and that's getting ordered today.
Don't worry, it'll be tearing up the neigborhood soon. :)
As for the driveshafts, look at doing the switch to revo ones. They're tough and inexpensive.