Great choice Beast!
Let me see if I can clear it up.
The AVS head and the standard bezel head you are getting are separate and distinct units.
The AVS head is a complete head which includes the LED with your choice of optic lens (throw or flood) and your choice of bezel (smooth or crenelated). You just screw it on and it's good to go. It does NOT accept drop-ins. The optic lens and bezel are the only parts that are able to be swapped out. That unit costs about $110, depending on bezel choice. Go to Elzetta.com and play around with the "configurator" feature, you'll see what I mean.
But here's the fun part! The bezel and lens kit you're about to get is where you're going to put a drop-in. I think many would agree that the Malkoff Devices -
https://malkoff-devices.myshopify.com/ - are among the best but there are many others. (Illumn.com has various drop ins by Malkoff also.) This is where you can choose various outputs, tints, etc. You can call/email Malkoff Devices and believe this....they are top notch people and your questions will be answered! Very friendly and helpful. Tell them what you have in hand and what kind of tint, output, runtime you might prefer and you will be steered in the right direction. About $50 and very simple to install. The original Elzetta head (such as the one you have on order) is designed and built to perfectly accept Malkoff drop-ins with no modification. The lens kit you're getting is necessary since the drop-In itself does not have a built-in lens.
As Grizzman has said, the AVS head is a very powerful, great beam but it's kinda big (~1.5" at the bezel) for pocket carry. (If thats your thing). The great thing is, like I said, you just buy it and screw it on and go.
(I have an AVS but I stuck it on a 3 cell Charlie and keep it as the "home defense-invader-blinder-light-everything-up" light next to my bed.)
For what it's worth, the Bravo with the standard (like yours) or low profile bezel with a Malkoff M61N drop is a very great combo for carrying around for everyday use. My own opinion of course!
Good luck and have fun! Let us know which way you go on this!
I was also very encouraged by Grizzman's Oveready testimonial and a Bored Bravo body is on it's way!