Someone just did a review on here on the 4sevens Quark. They have a model that runs on one AA or one CR123A. Of course performance is greater with the CR123A, but I like lights that run on the AA's (I have several of the Pentagonlight Molle lights like you mentioned and love them).
Knife works has them. I only provide this link because you can compare so many models along with the Fenix lights. I have a Fenix and like it very much, but a Quark may be my next light.
http://www.knifeworks.com/fenixflashlights-3.aspx Of course, you can just go to the 4seven's site too.