I have one of these and like it.
http://www.action-lights.com/flashli...ter.asp?bhcp=1
I carry a mini-mag most of the time because I use a flashlight for non-defensive purposes most of the time.
If you grab and twist at the same time, a mini-mag works wel. It can also be used as a "compliance tool."
I place the flashlight on my back hip on my weak side.