Selecting a Large DC Motor?

Hi,

I was referred to this class from a co-worker. I appreciate it very much thank you. I've been doing research for a project I want to start for the past year. I've been leaning more towards brushless motors and controllers for no apparent reason. For my project I want to convert a 50cc quad to an electric RC car. I plan on using a PS3 controller, arduinos and xbee links.

Do you think the brushed motor would be a better choice with the alltrax controller? Why or why not? I was looking at golden motor 3000w and a roboteq controller. Anyway you can offer me some advice on which direction I should go? I'm ready to start buying parts.