Eagle tac, jetbeam, 4sevens quark, nitcore, zebralight. everyone of these lights have better technology, longer runtimes, better output settings that surfire. Prices range from 50-100 bucks depending on model. all are waterproof, shockproof and made out of aluminum with scratchproof crystals. Awesome lights! my favorite is the eagletac d25c and d25c2.
I am releasing a podcast on flashlights, headlamps and lanters on wednesday and a video about showing the differences on thursday.
Nothing against surefire. i have owned 4 of them. but in my opinion you money is better spent on one of these others as they are beeter in many ways, just as reliable, and cost upto 4 times less.