I don't want to try and take over the Scorpion V'S G2 thread. But I have had a very positive experience with stream light lately. I'm an generally not a hardware guy and don't post or reply on hardware. However the Microstream light is, in my opinion worth mentioning. Take a look.
Streamlight - Key Chain Light Series - MicroStream®
I now have two of these lights. One goes with me everywhere. It is the solution to my off duty flash light carry needs. This light is bright enough for all of my tactical building searching needs. It fits in the corner of your pocket, takes an AAA battery, and works well for strobing/tactical work. If you shined it into a dirt bags eyes at night, he would be momentarily blinded for sure.
My other one is attached to my investigator jump out vest, to insure that I always have two flashlights. It only cost me $15 dollars per light, and it dose the job of a much bigger more expensive light.
Although I am highly recommending this light, I have to tell you that I haven't had it for a long time and can not tell you whether it is durable. With that said I am very happy with it.