You don't mention what speakers you are using, but the added muscle of the 200's would be good. Going from 80w to 100w isn't a big jump.

I added two M200's (L&R front) to my system. I was using the 750 and an old Denon for the back channels. The M200's seemed to be an upgrade from the 750 in two channel, they sounded more detailed than the 750.