You don't necessarily need a dyno hub. There are some other dyno options such as a bottom bracket mounted dyno or one of those units that clamps onto your fork and has the light built in. Take a look at Peter white's website, he has some options available as well as another dealer called yellow Jersey.

But I do agree with the other posters, it sounds as if you could get along fine with a battery light. If a dyno's 3 watt output was good enough for you, then I recommend the cateye EL-320. Self contained, no cables and plenty bright with flashing mode to boot. Supplement that with a Printon Tec "EOS-bike" on your helmet.

Lot's of good tail light choices out there.....make your own choice.