Building my first robot, Help needed please.

Hello everyone I've tried looking for forum posts regarding my problem but I haven't seen anything specific to my situation, I’m trying to build the robot in the guide by kawal "http://communityofrobots.com/tutorial/kawal/how-make-your-first-robot-using-arduino". I could use some help if anyone can answer my question. I've tried building this robot but I used the wrong dc motors, they have an 8600 rpm but they can't carry anything, little torque I guess, they stop as soon as I set them on the ground. I'm using the arduino motor shield and I was wondering if these motors in this link would do the trick "http://www.robotshop.com/pololu-80rpm-plastic-gear-motor.html?utm_source=google&utm_medium=base&utm_campaign=jos”. Would 2 of them share the 6v well and would it support the load? I'm basically using the same parts as Kawal so it would be a similar load. If you know of any other good not too expensive dc motors which would you recommend? Any help would be greatly appreciated, thank you in advanced.