I'd recommend looking at shiningbeam.com. Check out their own lights (by manufacturer shiningbeam) and get one of the XM-L X-Thrower series. Be sure to get one that is driven pretty hard, as you can see from the specs. Should be about 60 bucks. Similar lights tend to go for 100ish by Quark, 4Sevens, etc. But you can shop them by goinggear.com under 1x18650 flashlights and see what you find.