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Here's my understanding: The voltage on the motor doesn't mean much. My 24v motor is run at 72v with no problems. Other people on here run their 36v or 48v motors at up to 144v. The 1 hour amp rating is pretty important. The higher, the more torque you can use. Mine is rated for 102amp for 1 hour, and it works fine for around town. It weighs 60 pounds.
For controllers, they get more expensive above 72v. Heck, they get more expensive above 48v. Curtis and altrax are the most common at low voltages, at least on Ebay. For a controller, apowers on here got a control board and power board from me, and used the spacing on the power board to drill the rest of his parts locally. I don't know what his total cost was, but it wasn't anywhere near the cost of a Curtis 1231C.
As for a contactor, I recommend the kilovac EV200. They can be had on Ebay for around $65, and work very well.
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