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That controller doesn't look too bad.
I havent' heard a ton about Kelly controllers yet, but I haven't heard anything bad about them either.
I suppose the rule of thumb is to get as many amps and highest volts you can afford.
I think that controller would suffice for you.
Doubling up motors and controllers would get complicated and expensive.
Jim Husted of Hi-Torque Electric has been building some "Siamese" motors with great success, but that's kinda a wacky drag racing thing.
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