[RC-Monster Mike]

I agree, the 9920 is a better controller choice. the xl1200 could be run on 20 cells with the 7018 controller, though, which would be pretty silly in the power department! All The Lehner basic xl motors are capable of the same power output, but the slower turning motors make the power with voltage as opposed to amperage. Personally, I would run the xl2000 motor. It will have excellent runtime, as well as the ability to easily achieve your speed goals and could take some additional voltage if you want to push the envelope. The xl1200 is a great choice for higher voltages (25 volts or so would likely be the sweet spot for the xl1200, while 17 or so volts would be the sweet spot for the xl2000).