Well , with Dan's conversion and the new DBC blown boards should be less of a problem. Being that you are using such big motors, El Mod may be your only choice. I'm not sure even the SLU can handle the draw that those motors creat. You would have to check with the guy's that are using them.
I'm just looking at it from the perspective of Should something go wrong I would rather it be a 20.00 dollar board than a 200.00 package.