Surefire and Fenix both make wonderful (and VERY different) lights. I've got a number of models from each. Add in Nitecore D10, a couple of JetBeams, Malkoff LA's, and numerous others.
Surefire was my introduction to quality lights, but fast forward to today and other makers have engineered much more versatile and attractive lights which are offered at much lower prices. Biggest issue for me with Surefires is the requirement for most of their models to be powered by lithium primary cells. These are a great power source, but get weaker with every use and must be thrown away in time... much less desireable to me than li-ion rechargeables, which many wonderful competing models are able to be powered by.
With rechargeable li-ions you can start every day with fully charged, 4.2v of potent power. Li-ions aren't for everyone, but for those who want to understand and use them... they're a godsend power source! And pretty much all I use to power about twenty five different flashlights with, ranging in size from AAA-size to AA-size, RCR-123, 14500, 17670, and 18650. Li-ion. It's the future, today.
Overall top choice/bottom line for me (and numerous others here and over at candlepowerforums.com) is 4Sevens Quark series. And of all the Quark models (most of which you can lego til your fingers go numb) the Quark AA model sings the sweetest. You can power this with a AA-sized 4.2v Lithium-ion rechargeable for amazingly bright output, AA-sized NiMh rechargeable, AA lithium primary (about 16 year shelf life!), and even the lowly (and ubiquitous) AA alkaline cell. The Quark has a brilliantly bright turbo mode, a pip-squeeky wonderfully low "moon" mode, several levels in between, warm and cool color LED options, and a couple of emergency oriented modes. Quark heads, body tubes, and tail caps interchange galore for forward clicky, reverse clickie, momentary, etc. This is an amazingly well designed system of flashlight components brought to us by a great company for very reasonable prices. 4Seven's Quark. Check them out!