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Download the JVN calculator and look under the first tab called "Specs." It has all the information you would need about the motors that are supplied in the kit. It also shows specs on stall torque, stall current, and free current when you combine motors together. And of course you can easily calculate the speed of your drive train, rotary mechanism, linear mechanism, and intake mechanism as well. It's a useful tool. Download it from here.
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I can't stress this tool enough. The biggest thing we gained from using this tool was figuring out why we were pulling so much current on our '07 robot. To alleviate this, in '08 we used 2 CIMs per side in order to facilitate pushing through traffic along with a AM Super Shifter. 23 amps sustained per motor ('08 low gear) is ALOT better than 65 amps when pushing ('07 single speed)...
I also fourth the AM recommendation. I just found a local machine shop who may be able to do custom gearboxes for us in future years but until we reach a deal in coming months, we plan on sticking with AM shifting gearboxes. The problem we had this year was an error on our part and the AM rep in Atlanta stuck with us until we found the issue.
Great parts, even greater people.