Rod at Wildcat recommended I go with the box first, then the injectors, on the theory that I would already have a boost fooler built into the box (PM3 in my case) and extra $$ would not be wasted on something essentially redundant with any of the boxes.
I put on the PM3 box and really like it. I have so far been able to control myself with the loud pedal and the adjustable remote.
Then when I added the Mach II injectors, I have the PM3 box "off" for now, but the boost fooling function still works, allowing me to pull 29psi on the injectors with no codes.
My $0. 02
Tim