At approx $80 the Cygolite Metro 500 is a great headlight. Its very highly rated on a number of different websites and I have met a few people that have it and they love it!
SpencTheGiantI've had a Cygolite Expilion 250 for a couple years and it's a solid light with a great beam, and even at 250 lumens it's pretty bright. I wouldn't hesitate to recommend them.