Wire recommendation needed.
Does any one have a recommendation for what wire I should use, particularly to power my rear light? I have a Son28 in the front with a Son Edelux front light and B+M Secula rear. Also want to wire in a Sinewave and a Voltaic pass-through battery for my various gadgets (I followed Tourist in MSN 's advice when building my bike, as discussed elsewhere.

Initially I wanted to use door bell wire (2 separate conductors) but it's so thin that I am concerned its resistance is too high over the length of the bike. Both lights use alternating current. Can I use the bike frame instead of one the wires and then just rely on one conductor (it wouldn't technically be called ground, but same idea)? I need something wiht low resistance and a sturdy insulation, taht I could hopefully thread through the fork.