I've mentioned this several times in the past, but it's been awhile so I'll say it again...

I set my room up for 7.1 for awhile and didn't find the difference between it and 5.1 worth the cost of the extra speakers and extra two channels of amplification. I ended up taking the M2i's down (I was using them for the rears) and put them upstairs on my computer. I'm enjoying them MUCH more in that capacity. The QS8's are amazing surround speakers. I honestly think 5.1 is enough for 90% of rooms out there.