I recently got a Maratac Extreme AAA flashlight for countycomm.com. I am on my mobile right now so it is hard to post a link, but if you search, it comes right up. It surprises me that they don't seem to come up much in discussions on here, but maybe I just miss it. Gets great marks on candlepowerforums.com, which would also be a good resource for you.
The Maratac uses 1 AAA battery, has three output levels (1.5, 20 and 75 lumens if I remember right), rotating bezel for on/off, Cree Q5 LED (up to 50,000 hour life), anti-reflective coating on the lens, and a reversible clip that makes it easy to clip on a baseball cap or visor for headlamp mode. Best of all- only 22 grams WITH the battery, and $22! The only thing that I think would make it better would be if it were regulated.
This is my primary light now, with a Photon Freedom backup. I carry it in my pocket everyday too, instead of a little button cell. It would make a perfect backup as it is tough, light, small and powerful enough to replace your primary light. You would never know it was there until you need it. Good luck in your search.