Fenix LD01 in stainless steel. A little heavier than the aluminum version, but not too bad. 85-ish lumens from a 1xAAA keychain light is impressive. The 28 lumen default is plenty bright for most uses.

This replaced my Arc AAA-P on my keychain. Great light, but just not bright enough (10.5 lumens) in some situations. It also replaced my Fenix L1D that I kept sticking in my pocket because the Arc wasn't bright enough.

I really like a lot of the LED tactical lights like the 4sevens Quark AA Tactical, but I'd rather have something like the Fenix LD01 with me than a bigger light back in the car or back at my desk.

I now only use low self-discharge NiMH cells like the Duracell "precharged" so I can keep them topped off and know that they won't leak like an alkaline. For a stored / rarely used light, lithium cells would be a better choice.