I have this model RC buggy:

It's called an X-Terminator.1/8th scale, 4WD, nitro powered and pretty fast. I don't use it in the dirt very often as it gets too dirty. I put a lil larger pinion gear for more top speed.
The only problems I've had with it are the pull-starter breaks fairly easily, and my nephew crashed it into the curb breaking a front suspension piece. I replaced that broken glass filled nylon part with aluminum parts on all four corners.