Man, congrats! That's going to be an awesome setup, and almost exactly the same as what I'm running!
The Invader has a great FX loop, and I would definitely recommend running any "mod" effects through that. It does have 2 effects loops, but you can't turn BOTH of them off, only switch between them. So basically, I leave one dry to turn effects off. I run my top row of my board through the loop and bottom in front of the amp.
I would go:
Guitar-->Tuner-->Keeley-->Decimator-->Front of the amp
FXsend-->Chorus-->Reverb-->Carbon Copy-->FX return
IMHO, the carbon copy is SUCH a good match for this amp. I run my effects loop fully wet- it takes pedals really well.
Of course, experiment with positioning and tweak to taste!