I don't know what your intended use is but not many people know about LED Lenser. Very good light for good price. Do a search for the name. They are distributed in the US by Coast.
4sevens for the win. The Quark AA^2 is your best bet as mentioned in previous posts. The Quark AA^2 Tactical has a momentary activation switch if you need that application.
If it doesn't have to be brand new check out some of the Surefires on Ebay and other auction sites...you might stumble into a good deal on a good light to last a long time.