Current commuter setup:
1000 lumen SpokeGrenade Headlight:
Princeton Tec EOS (mounted as helmet light)
2 PlanetBike Superflashes
Busch & Muller 4D Toplight
The helmet light is nearly always with me year round (basically on the helmet or in a saddlebag, unless I forgot it in the garage... doh!)
The SpokeGrenade 1000 lumen headlight is a recent upgrade, throws a lot of light, haven't really had a need to run it at full power on the road yet, on medium its plenty of "to see by" light".
I've also always liked running a helmet light, not only as a backup, but as a "visual horn" to point at cars coming out of side streets.
The Superflashes are nice, but not excessively waterproof. I think they may have fixed that in the more current models. I wrap a bit of electrical tape around the seam to keep out water during the wet months around here.
The 4D toplight is bolted to my rack, so its always on the bike, no flashing, just a steady light, surrounded by a big reflector.