quick google search yielded
this 12VDC control, 1-1200RPM, 60in/lb torque
and
this 24V, 0-3000RPM, up to 50 in/lbs torque...
The problem that you will run into though is that the more torque you need the more current you need, the second one is rated at 22W thats almost a 1A draw, so you would need a pretty large battery pack to run it for long