There are more options out there now than every before - LEDs are a game changer. My one suggestion is get a USB rechargeable model. With batteries, I used to always carry spares and often took out partially used batteries, not wanting to start a trip/outing with partially spent ones. PITA. With rechargables, I'm *always* starting out fresh and I've even done long trips carring a small folding solar panel to top-up the headlamp or other devices. In the ideal world, a light where the recargable battery is removable - for that odd time when you ran out of juice and *have* to do something - would allow you to stick in a couple of AA or AAA's.