Gas powered will run quite a bit more than what you are looking to spend, but in the same sense, will be MUCH faster. From the sound of it, it seems like youare interested in getting him an on-road car. For some decent ideas for electric on-road cars, Click HERE! Hope this sets you in the right direction. As for runtime, one battery pack will usually last between 6-10 minutes, depending on the batteries capacity. If you go with electric, get at least 2 battery packs, and a decent peak charger. this will keep him up and running.