Hey jediknife, big shout out and welcome to CPF!
Robocop's right, there's not much competition for the Arc-AAA. The Dorcy (found at walmart and soon at target) has a much larger head (but is cheap), and the Sonic from Infinity looks weird and has the LED recessed, narrowing the spill. If anything, the Photon 3 is what I might consider EDCing with keys.
The ArcAAA is so small, it's like just another key on your chain (ok, a fat round one that's hard anodized). If you don't want to wait, I got my Arc AAA turquoise from pocketlights, and david also has the orange AAA in stock, too. The turquoise (actually, it's green) is the brightest Arc AAA, but it's downside is that you lose some color rendition by not having a white LED. Speaking of white, there's little difference between the standard and the premium AAA.
If you are willing to go to AA (not so easy to put on a keychain), both the Arc AA and the Ultra are nice. The Arc AA stands on it's tail as a room light, the Infinity doesn't, but at $14.50 from CountyComm the Ultra-G is a great deal. Any of these would work on a neck lanyard, too.
If you search the forums, you'll see many discussions on these torches in comparison to each other, with beamshots too, to help you make a decision. IMHO, you can't go wrong with the Arcs. In a month, I went from 0 to 5 Arcs. Like Robocop says, it's addicting! I must add, impoverishing, too!
welcome again,
daloosh