I personally don't like having to deal with external battery packs and wires and such. I wanted a bright "to see by" light with integrated battery and USB charging, and the Cygolite Expilion fits the bill. I picked up the 700 lumen model on Amazon right after Christmas for right around $100 or so (I think it may have been on sale).

It's been a great light so far. It uses an 18650 cell, which resides in a proprietary casing. That means you have to buy their battery if you want a spare, for around $30. But the cell is removable and you can swap out cells if need be.