Thanks guys, I thought it was a pretty good deal too but have only had low ballers so far... one guy offered $300 for everything...
As to the motor, here is a calculator that you can use to find the rpms based on the gears, motor kv and efficiency and the battery. Whether that particular motor will work or not I'm not sure.
http://www.darkhorserc.com/other/h/old/v1-0b/calc.htm