try to think of mag modifications much like you might thing of home lighting:
At home, you can just have standard screw base bulbs and run 60W incans all over house and nothing to think about, this would be like buying your standard 2D mag and just using it.
but you know that for your home, you can also buy 100W bulbs, 40W bulbs, different light fixtures with different size bulb bases, track lighting fixtures that take a wide variety of halogen loaded track lighting lamp assemblies, florescent in all shapes and sizes: CFLs, T8s, T12s, etc... rheostatic switches, clappers, electrostatic, remote control. and on and on.
For a home owner, the concept of all these different lighting options sets in pretty quickly because you can walk down to a home depot and see all the standard pieces and parts and how they look and how they fit together and all the confusion is gone because you get to SEE it. visual learning.
For mag modifications, it's the same type of scenario, you're just matching parts together that are compatible, and picking out the most optimal configurations.
Why am I rambling on an on about this? Just to say, that there isn't really a "best" configuration out there, they all have compromises. there are probably hundreds of bulbs that would make good potential candidates for maglite modifications. Different configurations of possible batteries, bulb base adapters, reflectors, and or switch-replacement assemblies may be required to run certain bulbs. Every "popular" build is popular for a good reason, but that doesn't mean that there aren't more options out there that are equally ludicrously bright that aren't "mainstream" with the popular builds.
You can pretty much guarantee, that as you go to higher powered builds, the complexity and expense will increase as well. There are minor exceptions but this rule holds true on the larger spectrum pretty solid.
Eric