The thing to remember about f/e swaps is it is easier if you do the WHOLE thing - triples, stems, forks, wheel, fender, brakes... Otherwise you have to worry about the spacing of the forks and the shims on the wheel....
I think the reason the B6 isn't mentioned is because it's not seen as much of an upgrade. The same could be said for that of the SV650. I think they are attractive simply for dual front brakes.
On the tail light thing, it's either wiring (probably right at the light) or more likely a burt filament.