My imediate plan is to run the Mains and centre channel off the Emotiva. As you mentioned above I would keep the rears on the Denon for now. I then would have the option to buy more modules for the rears and back channel.
I am even thinking of trying a dual VP150 for the Centre channel. The Emotiva will hold 8 modules so the would give me two fro the centre.

Pioneer sc-1525
M80 HG Cherry