My honest opinion: pick up either an old 6PL (without the new KX4 head) or better yet: buy an original 6P. I'm fairly new to the Surefire addiction myself, having bought my first one only a few months ago. I picked up a 6P original and I couldn't be happier with it. It offers exactly as much customization as you feel comfortable doing. You can switch the incan to an LED and call it a day, or you can literally change every single part of it. It's a great feeling having this one dependable flashlight that I can constantly modify and experiment with.
A good start might be buying the 6P host and then purchasing a drop-in to replace the incandescent bulb it comes with. Malkoff's creations are highly praised, so take a look at something like:
http://www.oveready.com/led-light-e...w-single-level-drop-in-3-4-9-0v-/prod_61.html. Later on, you can look at Nailbender's creations, or a Moddoo drop-in.
If you purchase a sealed head unit like the 6PX, that's it. Two years from now when you look at upgrading, you're buying a whole new light. With the 6P host, you keep the same old body you know and love and simply upgrade the emitter. It's one of the most well-known hosts (look at the Flashaholics Top 10 list) and a huge number of people offer modifications for it.
Right now, my 6P has:
- stock bezel, but I replaced the o-rings in it with new ones (including a glow in the dark one), replaced the pyrex glass with ultra-clear glass and added a polished stainless steel bezel ring to the end
- replaced the stock P60 incan bulb with a Nailbender SST-90 that does about 550 lumens in a nice wide flood
- stock body (but may purchase a bored body that'll allow thicker rechargeable batteries)
- stock tailcap, except I ripped the guts out of it and put in a McClicky momentary switch
It's actually a bit addictive after a while - you might start small but eventually you'll start purchasing more and more upgrades for your light. My favorite light by far, hopefully whatever you purchase will be the same for you. :thumbsup: