I'm looking into modding my 2d maglite first by having it cut down to the 1d size along with the the machine finning of the body and head by Will. My questions are(even after searching threads), what is the best led modification or drop in? I've looked at a lot of the stuff nailbender has to offer, but not sure which is the best bang for the buck. Is the fusion 36led head any good? After seeing all of the options I can have as far as battery choices, what would be the best there? I like the ideas of the 18650 single cell, but the AA holders look nice too.