I have a Glock Model 22 http://www.glock.com/g22.htm now, but it does not have mounting rails. I am thinnking of getting a newer one with mounting rails. If I do, I will need a pistol light. Does anyone have any experience with these? Is one pretty much just like another, or are some better than others? I know about the Streamlight M-6 http://www.streamlight.com/m6_information.htm the Glock Tactical Weapon Light http://allglock.com/viewcategory.aspx?idcat=76&sm=0_10 and Surefire http://www.surefire.com/maxexp/main/co_disp/displ/carfnbr/259/prrfnbr/1112 are there any other weapon lights that I should consider?