For reference I'm running a Denon X6700h and I am adding a separate amp. Normal listening levels are fine but when I'm running all 5 channels you notice a huge drop in performance especially at high levels. I think you would be better off running the M80s with the Rotel and you can run your remaining channels off of the Denon.

LFR1100
VP180HP
EP600
M3 In Ceiling x 4
M5OW
M2 - Atmos rears
ADA1500.5
M3 Outdoor Speakers
ADA 1000.8