So, now I've followed the great links for options to check for a conversion kit (hub motor), and the Currie e- and izips (non-hub motor)... if I'm looking for a good prefab bike with a hub motor, what would you suggest? I'm afraid that the top-of-the-line Optibike is out of my price range, and I'm actually starting to think that some of the initial advice to build one may be the way to go... :/