I myself would opt for another set of QS8's. You have no room for sound diffusion to take place so those direct radiating speakers are going to give you pinpoint sound from the sides. You could use 2 M2's in place of the present QS8s as those points look to have a good distance to the listening position and then move the QS's to the side surrounds, to save some money.


Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70