I hope I am not too late because we basically have the same AVR. I own Onkyo TX NR-777 and as of right now... Not only that, but I am running just a plain old school 2 channel with RF-7 iii's.
The AVR I own has about 105watts at 2 channels driven, at 8 or 9feet away, and it powers my RF-7 iii's fine.
I'd suggest tower speakers if you have room for it and also depending on your budget.
PS. I plan on upgrading my AVR this year and grabbing an amplifier.