I use a Cygolite Mitycross 300 (~$110), and it is extremely bright with very good coverage due to the dual LED design. The headlight itself is extremely small, and the battery pack is so small that I can just velcro (included) it around my stem. Extremely intuitive one-button function with low battery indication and very good battery life. There is also a 350 version that is brighter by 50 lumens (300 is 300 lumens).