seVinci:
2. The DfRobot 4WD which has been very popular and uses a Romeo 328.
http://robosavvy.com/store/product_info.php/cPath/21_1200/products_id/989
I got one of these, and I totally love it!
It was easy to put together, can take a lot more beatings than it should ever get from normal use, and it can actually drive over a lot of things, like high doorsteps and so.
