FYI - Biketiresdirect.com has what seems like a pretty good deal right now on a dynamo wheel. For $250 you can get a DT-Swiss TK540 rim laced to a Shutter Precision PV8 front hub, DT Swiss Competition spokes, plus an iLumenox Vega 6V LED light. You also can buy the matching rear wheel -- sans generator hub -- for $140. Prices include free shipping.

https://www.biketiresdirect.com/prod...-and-light-kit

If I commuted on just one bike, I would jump on it. However, I frequently ride different bikes on my commute, so a rechargeable LED light works out better for me.