I have the VP100 & M3ti's up front powered by my Harman Kardon AVR520. It sounds beautiful. Best money I spent on my system was getting Axiom speakers.
I have JBL N24's for surrounds so I can't tell you about any QS's. What I plan on doing eventually is to get some Axiom M60's and put the M3's in the rear, getting rid of the JBL's. I think in my space, direct-radiating speakers would be better surrounds. BTW, I'm running a 5.1 set-up.
As far as your receiver choice, I've only heard good things about the Onkyo 600, even though I haven't heard one. MY 2 CENTS: when I was shopping for a receiver, it came down to the H/K and the Onkyo TX-DS797. But, after listening to a side-by-side comparison I bought the H/K on the spot. But get out there and listen to different stuff and make YOUR own opinion.