I have been looking at the sandwich shoppe for the brightest sandwich I could find, but still run Nimh AA's or even alkalines if necessary. I think I want the Nexgen BB 750 with TWOJ, but there are other sandwiches to choose from also: BB500 with TX1J, Nexgen500 TWOJ. Also, why couldn't I just get the step-up converter board, and put the led on myself. wouldn't it be cheaper? Do any of these run too hot to use with the stock reflector? If so, where can I get a different reflector.