Here is a rolling chassis. Drop in a good .28 engine and radio/servos, and you will be well off:
http://www.teamlosi.com/Products/Def...rodID=LOSA0802
Engines such as the Picco P3 28, the Axial .28, Dynamite Mach 28 and a few others are very good options.
Pure kits (building everything from shocks to the clutch) include vehicles such as the Hyper ST truggy from Ofna, the Jammin' CRT from Ofna, Kyosho MP777 STR truggy from Kyosho, and the Mugen MBX5T. Be prepared to provide everything from pipes and clutches to wheels and tires. Kits provide value and knowledge, but a roller like the Losi is a very good way to get into it and not have a cheap RTR.
www.nitrohouse.com