The guy doesn't give much info on the motor but to say DC brushless. Without a HP rating it's hard to suggest something. The size of the motor will have a large affect on how fast it starts and adjusts to speed control (if that will be important). But too large would be noisier. I would think something like .25hp would spin a Styrofoam drum well enough and not be too noisy? Between the motor and speed control you'll be into parts for over a hundred bucks (if you shop bargain products) unless you can find something used on e*bay and takes yer chances.