Ok so spent time and time and reviewing specs and looking and measuring the room and costs.
For my room 11.5 W I thinking I don't know. I am going to go with the 4 - M3 on walls. My argument is this. These are 5hz higher at 60hz. So my subs in rear which will eventually get there EP500 will probably negate the extra 5hz I get from the M5hp on wall. Specially if crossover is 80hz.
I am going with 4 M3's for the heights. I will be doing the ceiling as a drop ceiling anyways however, I will design it so the M3 are up in the recess part and will still be 7.5 ft from the front.
Just want to figure out if ATMOS is really worth the extra 2500$ . That's what four M3 and a MCA50 would cost me. Or would I really be better off with 9.4 just stay with the 7.4 and add front heights?

Anthem MRX520
M5HPv4
VP160HPv4
QS10v4