Balancing robot for dummies

I was thinking about using:

sensors: RobotShop | Robot Store | Robots | Robot Parts | Robot Kits | Robot Toys

motors & wheels: RobotShop | Robot Store | Robots | Robot Parts | Robot Kits | Robot Toys

motor controller shield: RobotShop | Robot Store | Robots | Robot Parts | Robot Kits | Robot Toys

Arduino controller: RobotShop | Robot Store | Robots | Robot Parts | Robot Kits | Robot Toys

I will settle on a battery pack and voltage regulator once I final my component choices.

The MCU is 32-bit with a 16MHz crystal, the motors' RPM is 242 and the wheels are 2.5" diameter. Are these fast, large, and good enough to balance properly? My instructor seems to think there will be problems with different torques of each motor. How much validity is in that? Any other issues I'm overlooking before I start?

It does feel like I'm not entirely sure what I'm getting myself into, but I have a few months to figure it all out. This forum will make my life much easier; I salute you [smiley=beer.gif]

Brian!