Here.
http://www.traxxas.com/products/elec...rx_rustler.htm
Traxxas makes probably some of the toughest r/c cars available. This truck will do 35 mph out of the box which will keep your boy smiling from ear to ear.
plus, with the brushless technology already equiped, you dont have to worry about rebuilding electric motors. brushless = maintanence free.
This might be a little more expensive than a Duratrax Evader, but This truck will last 5 times longer.
Traxxas has excellent customer support and thier cars are top notch for beginners.
Good Luck in whichever you decide.
Cory