Arc-AAA on the keyring, always, and in my day bag an e2e (winelight version) with Valiant concepts head and Malkoff M61LL. Surprisingly, the Arc still works well even though it's no longer the new kid on the block, and the purple body/black head Surefire is an ugly little bugger, but the runtime and light is exquisite. Wouldn't trade either one... :thumb: