I have both of these. The first one I put on my Timbuk2. The LD600 is always ran in random mode, which goes a long way on the batteries.
http://www.cateye.com/en/products/vi...d=7&subCatId=4

http://www.cateye.com/en/products/vi...d=7&subCatId=4

As for a front light, I have a cygo light explorer. But that is for when it is really dark. I plan on getting something like this for when there is still some light...http://www.cateye.com/en/products/vi...d=7&subCatId=2