I wouldn't recommend those controllers. The current capacity figures are hobbyamps (not true amp ratings) plus interfacing them with radio gear would be a pain.

Some examples of heavyweight controllers used these days,

- Vantec
- Roboteq
- Vex victor BB
- Ragebridge (these probably won't take the full 36v you plan)

In short, they aren't cheap but if you buy cheap you'll end up spending more cash when they blow.