Hi,
Why dont you just use a PICOLOR?
You dont need to know much about electronics and you can pretty much just connect it to a PC, I'm doing exactly the same thing as you with a sumo type robot.
This display has input/outputs that can drive motors and read sensors all using the PC, you can even display things like battery voltage etc..
If you find a good radio board let me know because I need one for exactly this.
El
P.S this is the link
www.picolour.com