Hey Bakajon
My room is about 10x20 and I'm running M22 Mains, and QS8 Surrounds. No Sub, No Centre and a Denon 1910 at 90W / channel. I was on a tight budget when I bought.
Yes, I agree, surrounds are more important than subs unless you're using a cheap Home Theatre in a Box. My M22s alone put out better bass than my old "1000W" Sony HTIB with a "sub". Between the M22s bass and the Denon's Phantom Center, I don't feel an immediate need for a sub or center.
The M22s will pull 200W per chanel according to specs. However, 90W Denon ARV-1910 more than fills my room and I've *never* had to turned it up to full power. -13 seems to be the sweet spot. Anything over that really *is* uncomfortably loud! 75W should be enough for your needs.
Side note, I bought my Denon from Dakmart also.
All my cabling is from MonoPrice and a local store.
snazzed