If you built Hughs 8' machine, I expect you'll see 1000 watts or more at times.
If its 12V I'd suggest a Trace C60
For 24 or 48V I think a C40 would be fine. A C40 would probably work OK at 12V too, they can handle up to 80 amps for short periods I believe - but at the lower voltage Id probably go with the larger controller.
Youll also need an appropriate dump load (heater).