Up your budget and get the front light cycommute recommended. I bought one at the start of this winter and couldn't be happier. It's as bright as one of my car's headlights. The whole external battery thing threw me for a loop but once I figured out where to mount it I've pretty much forgotten about it until it needs charging.

After 3 winters of commuting with the little 1-watt PB front light I can't believe I didn't switch sooner.

As for the rear, the Planet Bike Superflash is good. That's what I use in back.