@zinprogress you probably know more than the average joe about the fundamentals.
Ideally, you pick speakers first, based upon your desired results, and considering local acoustics. A room is a bit different than the cabin in an automobile, but the point is that the speakers are where the rubber hits the road, so to speak, so that's where you should focus your efforts, rather than starting with the Sony AVR. It will suffice, with what we would recommend given your budget.
Don't quote me on this, but I think Dennis Murphy is going to again offer the Dayton/PE based AA monitors. If so, those are worth considering.