Everyone knows I am a fan of Parallax, but I am not too sure if I can justify this purchase any time soon. However, this might be a good starting point for your autonomous robot project. It would save a lot of time designing the power plant and hydraulics. Then again, it might qualify for a remake. I have to admit, I am a little disappointed it ships assembled, since building something like this is half the fun!

This giant gas-powered robot sports a 4-stroke engine and hydraulic power train. It is controlled by a Propeller chip for the ultimate in customizable robots; eight 32-bit cogs at 20 MIPS each create endless programming possibilities. A 64 KB EEPROM leaves 32 KB for non-volatile data storage, and ample expansion ports provide plenty of flexibility for added sensors.

The Propeller based QuadRover – Link