Robot build 7-10lbs, Need help with motors

Need help specing correct motors. Building a robot drive train two motors capable of going relatively fast and carrying 7lbs (10lbs max). I have the motor driver and am programming it with a RPi. Many of the specs differ in stall torque measurements and are a bit confusing. Thanks for the help!

The following online tool should help provide an idea of the torque / rpm you will need for each motor:
robotshop.com/blog/en/drive- … -tool-9698