I have an XM3 that I'm willing to sell. It is modded - I didn't like the original step-up converter, so I replaced it with a pair of MicroPucks in parallel (~700 mA drive), replaced the lens with a custom cut crown glass 1.8mm thick lens. The current draw from a pair of 1800mAh NiMH cells is 880 mA, so I figure the actual LED drive is somewhere between 600 and 700 mA. The LED was replaced with a TV1K, nice and white, fairly bright. Condition is excellent, some missing anodize on the very sharp edges of the hex part of the body. I can take pictures if you want. I used it for a while with 2 NiMH cells, but I'll sell it with 2 Alk AA's. I don't remember what I paid for it, but the MicroPucks cost me a few bucks, I'll sell it for $55 shipped to any US address if you're interested. It's a lot brighter than a stock XM3 which is terribly underdriven. If you don't like it, full refund. I have too many lights, just never use this one.
Rob