I would jump for a - get ready for this - "Surefire M14LT-CB AA Guardian Pro" that could tail stand.
Okay, so I extended myself a little bit of freedom in the nomenclature department, but I'll explain. It would look similar to the new M6LT Guardian. The CB means it would have a crenelated strike bezel, formed especially for any punks that would want to take my sweet flashlight from me. The L's for LED. I'm not sure what the T stands for, but I just went with it because I saw it in the title of the currently produced flashlight that I already mentioned; "Tactical" was all I could come up with for it, but if that's the case you can leave the "T" off, because I want more than one mode, hence the "Pro." A nice, dim low would be great in addition to an insanely bright high mode, with some practical levels in between. Instead of taking 6 CR123A batteries, it would take 14 AA batteries. I arrived at the number 14 by putting one AA battery lengthwise in the middle of six others, to form a circle of them. Two groups of these seven, one stacked on another, amounts to 14 of them. Two or three stacks of four would also suffice if these designs would have a greater predisposition to fit into a battery magazine design. I figured that such a large number as 14 would more than make up for any inferiority in utilizing AA cells.
I submit that if this mammoth beast were made, I would not only extend much of my attention to it, but I would even carry it with me on a daily basis everywhere, despite its size. To abbreviate, you could say I would CIWMOADBE,DIS; I know some people would simply say that they would EDC it, but that's just too simplified for my taste. It would be bright enough to light up any room, so with its tail stand capability you can just forget about utilizing modern fixed lighting technology altogether when I'm in the room. It would be my go-to light for nearly every application I can think of. I could play with this thing as much as I want and then charge up the batteries for nearly free when it's time to reload. This would offset the initial investment.
Surefire, are you listening?