Are you riding on illuminated streets, or are you looking for something to light up the road? If you're looking for a really good light for illuminated streets, I highly recommend the BLT super doppler DX. Super long battery life, no problems in the cold, and for what you're spending, it's pretty damn bright!

Have a look:http://www.blt-lights.com/superdopplerdx.htm

I have a white super doppler on the front, and red on the back. It takes 3 AAA's.