Thanks, ILLusion, the part about upgrades depending on each other cleared up a lot. I think based on the interlinking upgrade groups, I'm going to start off with only a few items, and see how it feels.
TK Twist Barrel
Stainless steel barrel bushing (if the barrel bushing insert is also visible, I'll add this as well)
Stainless steel spring plug
Stainless steel guide rod
Nozzle
A few Nitesite adhesive dots
LOL, the only performance upgrade is the twist barrel, but I want to test the MEU before I change it up too much. I've left the slide and outer barrel for the next major upgrade. If there's nothing else to change, I'm ready to send you a PM with my order

.