HBridge
The EZ-Robot 2.5 Amp Motor Controller will power the Meccanoid's movement motors just fine. Consult the HBridge ARC manual for more information:
With PWM (recommended: http://www.ez-robot.com/Tutorials/Help.aspx?id=192
Without PWM: http://www.ez-robot.com/Tutorials/Help.aspx?id=70