Hi Nicolas - I recall a similar discussion on this list before, but I can't seem to find it. The consensus seems to be (and I'm inclined to agree) that one of the best low-cost options is the iRobot Create, which costs about $130 USD. You can drop a netbook or laptop on top, and along with a Kinect, you have a very capable robot. -Dan 2011/1/27 Nicolás Alvarez Picco > Nicolas