i am really having a hard time trying to decide on which one of these lights from surefire is the most worthwile to buy. Whichever one it will be needs to be compatable with the luxeon heads that they will be coming out with. It will be used for every day carry in my pocket. I tend to like the ones that have interchangable lamps and brighter lamps available so that when the luxeon heads come out i will have three lights in one. any thoughts, questions, suggestions??? please help