http://andymark.biz/am-0270.html

saw that on the RFL forum. looks pretty good!! plus that website ahs some AWESOME stuff like a 2 speed gearbox you can shift with a servo , aluminium omni wheels etc

motor looks about 100w scooter motor-ish but with a decent gearbox and decent shaft on it
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www.demon50s.com - Minimoto parts
http://www.youtube.com/user/HyzerGlen - Videoooozzz

motor it is designed for
Peak Power: 321 Watts
Stall Current: 115 amps
Free Current: 2.3 amps
Aslong as you are running the right speed controler could be a good option.
A signel side drive is $148USD as well so not the cheapest option going around

Edit. didnt banebots create gearboxes for that motor as part of the FIRST competition i think its called.