Hello everyone. My son will be turning 6 soon and I'm tired of the junk from Target and Wal-Mart. After some research, I would like to go with 1/10 scale and my son would like a truck. I've looked at Traxxas Slash, Stampede and Rustler and the similar counterparts from Arrma. What should I go with? I'm willing to spend up to $300, but cheaper is better since the kiddo will only be 6. I do have a 4 year old as well who may want one as well because he has to have everything big brother has. If I go with a faster one, can a limiter be put on it early on? Thanks guys.