I commute to and from work in San Francisco and I would like to buy a headlight with a strength of about 150-200 lumens. Part of my ride is along a relatively well-lit urban street (Polk Street, for those familiar with SF), but part of it is through darker neighborhood streets (Cow Hollow and the Marina), where I can't really see cracks in the pavement or possible slick spots on the road. I'm considering the Niterider MiNewt X2, the Dinotte 200L-AA-S, and the Light and Motion Stella 200L. I've searched the forum and have read various things people have posted about these lights, but I'm a relative noobie (this will be my first serious headlight purchase -- I'm currently using a CatsEye blinkie), and these lights all seem pretty similar to me. Any thoughts on how to select a headlight from among these options would be greatly appreciated. Thanks!