Even if the Shimano Nexus dynamo is not what I wanted- I can't argue with the price.
Now I can afford/justify an Edelux light, or is there another light I should consider?
As this is a tarty 'French' city bike I may get a modern LED front and stick it inside an old Luxor light body...
http://sweetbike.org/2012/06/08/of-dynamos-and-bike-lights