Endless Sphere caters more to the high-power group; however, if you're interested in a Q-100C (4-5 pound motor - the "C" denotes cassette) and Dveh answers, you're in luck. He'll probably recommend a S06-type controller; with a lightweight battery (you can get the latest 36V or 52V, 7 ah which weighs about 3 pounds). Total for the kit would be about 10 pounds.