If you want the ultimate in geekdom, get the Vex Robotis kits. They are expensive, but a good deal if you know you love making robots. The part numbers that are the best deals are:
VEX-CLASS-1. This is the complete kit that gives you remote control and also a microcontroller so you can program the beast. If you just want the basics, then the
Autonomous Control Starter Bundle (276-2320-EASYC) is the same but without the other parts. And is $380 cheaper.
Plus if you went to the idTech robotics camp, then you can save an additional 10% by calling them directly and telling them the city and your camp name. Nice deal! But you do have to call 1-903-453-0800