I'd prefer Yamaha 685 over 2600. With my demos, Denon entry models 1xxx and 2xxx didn't seem inpressive/convincing. Slimlines from Marantz are good, their power may or may not be a concern. For my hall (which is L shaped and relatively big) - they didn't give me enough confidence.
Yamaha's 2.2 preout, may look ordinary feature, but it carries weight if you ever think of adding a power amp. (Which I am thinking of now)
I have v585, feature packed and great performer. Been using it for an year - but it doesn't have a preout. It's 7.2 channel and it lets you bi-amp front towers, which is a good option.