DeadButAlive
Newly Enlightened
I have all the lights mentioned above (in one or more forms) plus some others. I know its probably already to late, but for a 1xAA EDC light its awful hard to beat the Zebralight SC50. All 3 levels are just a click (or click-hold) away and each has a secondary level available. For a short little 1xAA light I find that the soft-press switch at the front is much easier to use than the tail clicky. The Zebralight goes as low as a Quark, as high as a Quark, uses current control for efficiency (as opposed to the D10's PWM), and is available in cool or warm tints. Since I got my SC50W+ all my other 1xAA lights stay in the drawer now, including my Quarks and D10's. If you are still in the market you really should give one a try - I already had Quarks and D10's so I wasn't expecting to like the SC50 as much as I do, it really surprised me.