The most thorough review of "tactical" flashlights can actually be found on TFL in the Gears & Accessories forum. There is a sticky thread that a fellow member, black bear 84, keeps adding to. His reviews are very helpful. He takes pictures to let you see the difference between the different lights.
I also think his BOREALIS with a retna scorching 1050 lumens is something worth looking at if you have the extra cash lying around
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Check it out!
http://www.thefiringline.com/forums/...d.php?t=239165