I would check out Dinotte lights since they are having a sale right now. Lots of cyclists were raving about the Magicshine LEDs last fall, but some are reporting problems with them, particularly waterproofness. I got a Magicshine (0nly $85) last September and haven't had any problems with mine, and it puts out an incredible amount of light with 3+ hours of run time per charge. I also have a Fenix L2D that I've used commuting for 2+ years but it may not be bright enough for trail riding. BTW, if you are riding in really dark conditions, you actually need less lumens to see well. Where the really bright, high lumen lights make the most difference is in conditions with a lot of competing light sources, such as roads with street lights, neon signs, etc.