Brinkmann 3 Watt LED 2D Aluminum Flashlight : 809-2082-0 - Buy.com
I got two of them. they are exact knock off of maglight with LED conversion, and i also have the double D cell maglight with LED conversion as well. It's just as good, for mear $10 cheaper.
I also have surefire that uses 123A battery. Link below.
Surefire G2 LED Flashlight
I've had this one for about two years now and very happy with it, I use it very often on the job. battery lasts pretty durn long time on it. 1 set of fresh new batteries will last about 12 hours. and I use them for about 30 mins at a time in most cases.