Sounds like you are on your way, try the 60s in 2 channel, which are the only speakers in question, and go from there. One step at a time.
As Mojo mentioned I upgraded from the 60s after hearing the 80s, but I was also going from M22s, and the drop in the vocal presentation from M22 to the M60 was quite large to me, so I HAD to upgrade, you are not me, so you need to make the decision on what you hear. Once I removed the M22s out of my HT room and just listened to the M60s with no comparisons, the M60s sounded really good. I really liked them and wished I could have kept them as well as buy the M80s.
And BTW, the sound difference between the Onkyo and Denon, well there isn't any, they are both good receivers, just the Onkyos are known to run warmer than Denons.
