JC, thanks for pointing that out or that would have been a big problem!! I was snooping around last night online and I see that Outlaw has some mono-blocks for $325 each; if I get two to power the M80s, do you think that would do the trick? Would I be better off with a Two-Channel Emotiva MPS (that's $1300+)? I was also looking at the Yammy 2600, instead of the Pio Elite, but that would need an amp as well. I don't love the Denon 3805 and the 4806 is more than I wanted to spend right now (I've seen it for $2,700).
On the sub, it's a somewhat problematic with City living due to neighbors and space issues, but I'll keep it in mind as a future add-on after I've broken in whatever I finally get. I've heard great things on this site about SVS.
I'd love to get the surrounds but there is a WAF issue on the QS8s and, since I'm renting, I don't want to tear up the walls with mounts and have to hide speakerwire in the walls. Unfortunately, there is no good place for a bookshelf rear like the M3s or M22s, but I have a pair of JBL Northridge bookshelves right now (S38) that I would hook-up as rears as a stop-gap measure for now since their placement is going to be cr*p (no choice right now).