Whilst playing the dream-spec-bike game, I had a google round to see what the leading dynamo light seems to be at the moment. Whilst I've always liked the Supernova on the Fuego, I really don't like their tailight, and apparently you can't just lob in another companies alternative due to 'electrical stuff'.
B&M latest offering looks lovely, though. Aside from the obvious stuff, there's: a remote handlebar switch that includes a USB charging port; an automatic and gradual switch between uber main beam and close-ranged floods as you slow down; automatic daytime running lights; clip on reflector; indicator light that shows if your rear light is still working (an utterly irrational fear of mine).
Shiny.