Charlie,
How about a Pila 3.7v 80 lumen lamp and 168S rechargeable battery. It's brighter that the P60 (not as bright as the P61) and you won't have to worry about batteries. Granted the initial investment in the Pila batts can be steep, but considering the cost of 123's and runtime, you will come out way ahead with the Pila setup.
I also have a G2 on its way, when it gets here, I'm turning it into a rechargeable. The good thing about the Pila 168S batt is that you'll also be able to use it to drive that KL1, KL3 or L4 you know you're gonna get sooner or later. /ubbthreads/images/graemlins/grin.gif
I think that the battery and charger where $76 delivered. The Pila 3.7v LA is another $17, but keep in mind that these will work in any Surefire 2x123 light, except the E series. The batt will work with the E Series, but the LA will not. I'm working on that though.