I recommend Fenix E01 or Fenix E05.

In the original post, are you sure about using an AA flashlight on your key chain?

I consider AA flashlights as being too large to be key chain flashlights. If you're using an AA flashlight on a key chain, then that's not a key chain; that's a tool chain. Also, performance-wise, AA flashlights are capable of throwing light to an extent that puts them in a different conversation than AAA flashlights.