I would recomend you dont buy Nitro, but instead one of the many 2-stroke cars, buggies or trucks. I like the Baja like previously mentioned but have a Carson Comanche with about 5HP. Here are a list of mods and some pics:
Jetpro Pipe, DDM Pre-filter and filter, DDM pull start cover, RC/PB Choke, Velocity Stack, Race ported 30.5cc Head Kit, 2mm stuffer stroker,wt813 f/pump,5745mg and 645mg servos and Wheelie Bar