I saw it too, thanks. I didn't try it but know I did. The motor does some strange stuff but that could be due to the constants I used.
I asked my professor of Control Systems class and he too recommended to use stepper motors for my application. They are better for specific angle positioning. So I'll probably get a setup but don't know which one. Personnaly I've been a Pololu customer and they helped me out on the forum so I'll get it there... The A4983 stepper motor driver with the unipolar/bipolar 42x48mm stepper motor is less then 40 dollars and that wil probably the final decision. It is a bit more expensive than Sparkfun's mix. But the motor has a good holding torque which is nice and the driver can deliver more current. Its what they call 'learning money'
I'll use my 2 DC motors and dual motor driver for another project (or sell it to a friend)!