I bought the 7.1 system advertised: 2@R-820F, 1@R-34C, 2@R51M, 1@R-41SA, 1@R-120SW. I am looking for a receiver and I am comfortable with either Yamaha RX-A680 or the RX-A780. I don’t need zone-2, but want to make sure the receiver powers this setup quite nicely. Anyone that would offer an opinion, or point to another receiver, I would certainly entertain another as well. I am trying to stay on a 5-700 dollar budget. It's what I can afford comfortably.