I will also suggest you check Maratac and ITP A3 EOS, they are to new to be included in the above roundup and I have not succeed in getting a Maratac.
My god, are you serious? Your reviews are fantastic, and are greatly appreciated by many of us here on CPF. Next time one pops up on B/S/T, shoot me a PM with your address, and I'll buy it and have it shipped to you. (If you need, post an "I'll take it" and then let them know I'll be paying for it.) There's no reason you should be without this light, and it's the least I can do to thank you.
Back on topic, I think the Fenix LD01 SS would make an excellent keychain light. The EO1 is also fine if you're looking for a less expensive, single-mode alternative. Though I haven't personally seen the Maratac, it's gotten great reviews here so far. Finally, if you don't mind going with slightly more expensive alternatives, Modmag's Draco (or its little brother Drake) are phenomenal: they're brighter
and smaller than any of the other lights mentioned. That said, they're also more expensive.
Finally, you might want to consider the Lummi Wee or the LiteFlux AAA lights. Liteflux lights have a more complicated user interface, but have been well received on CPF.
Hope this helps!
- FITP