If the surefire doesn't work out for you this has been my duty light for 5 years now and it is still going strong it has setting memory and a separate setting button which I love.
http://www.fenixlighting.com/products/fenix-flashlights-tk15.aspx

JYD#176
"dein Gott schickte mich zu zerstören"
"Sic semper evello mortem Tyrannis"
"Sometimes the chance of a zombie outbreak is the only reason I need to make many of my life's Decisions." General Delivery