Hi Faustblix,
Typically we ask what you are going to do with the system so we contour our selections to fit. Also what is the mix going to be => 100% Movies, or 50% movies and 50% music; or 25% Gaming, 75% TV Sports, etc. What are the room dimensions? Larger rooms require more powerful receivers. A 7.2.4 HT system is typically in a larger room. Where are the main seating areas? Is there row seating or couches, Lazyboys, etc. Is the room enclosed or open to another area? Etc.,
The KEF Q950 are quite easy to power at 91 dB, with the Q650 at 87 dB, and the Q150s at 86 dB less so. However, if you are in a large room and love your Metallica played at concert levels (
) with tons of Bass, you may need to up the power. I notice no mention of Sub Woofers in your post other than "eventually 7
.2.4". Care to advise why? In a Home Theater system they are critical components, and will assist greatly in keeping the amplifier for the main speakers smaller, and more cost effective.
There are 3 main recommended HT Receivers for most folks here => Denon, Marantz, and Yamaha. Personally I also like Sony in certain budget applications, but you really can't go to far astray with a Denon. (I have 2 systems with Denons). I'm assuming you are in Canada (like me!) so your purchasing choices are somewhat limited, and 7.2.4 HT Receivers can be well beyond your present budget.
So let's define the room and your needs before chasing a 7.2.4 HT Receiver. Checking into Subs would also be helpful.