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I have a 4QD NCC-70 going spare. Would be perfect for you, just attach a pot to a lever and you've got a speed control handle, and at a later date you can connect via an interface to an RX if you want.
Detail here - http://www.4qd.co.uk/prod/nccMk2.html
Un-used, yours for £50 !
I could be looking at the wrong spec sheet, but I think thats what it said. Its a massive motor though so its maybe right. It runs off of a car battery, so can't really change the voltage.
I have one of the smaller versions of the ones you're talking about Ed the NCC-35. I'll maybe wire that up and see how I feel about the drive being on the inside and if its all good i'll be in touch :)