As I've said, the Sanyo hub works great for me. Buy the best headlight you can afford. That's where the money belongs. In theory, the bearings in my Sanyo hubs will fail one day, and as they are irreplaceable, it will mean I will need to replace the hubs. But I'm not worrying about that yet, and I can build wheels.

I realized I haven't provided photos of my wife's bike (with the under-BB dynamo), so I hope to remember to shoot them tomorrow. She still has used the system only once, and she may never use it again, but it's there when she needs it.