for IIT event used cc2500 rf module + kit ( usb one ) we have
square dc gear motor tourque is 12kg
dc 12v current 500ma
heavy metal gears
http://www.vegarobokit.com/category.aspx?category_id=41
http://www.vegarobokit.com/sub_category.aspx?category_id=41&sub_category_id=87
http://www.vegarobokit.com/sub_category.aspx?category_id=41&sub_category_id=18
Most prefered vendor in Robocon2009