Kids pick this hobby up pretty quick. I would get him the best car that you can afford. I went from a prospec/Mugen 5R to a RC8 and liked both cars. The prospec, was bullet proof but a little heavy and didn't react as quick. The RC8 is blistering quick and has exceptional steering. Also reacts very well to changes in setup. The RC8 is new on the market, but parts are available online and more and more parts are becoming available at the local hobby stores. I am with your son who apparently has done his research. I would go the RC8 as I am sure he will quickly grow into the car instead of growing out of a car. Good luck!