I own Denon AVR 6300h. It is almost 2 months since I bought it. I had owned a pioneer vsx 921k earlier and I was quite happy with it. However Denon is at a different league compared to pioneer. Obviously Pioneer was an entry level (250 USD), however Denon one (1500 USD) is above the mid range. So it was expected to perform better. No doubt the Denon sound is warmer and clearer.
I bought a pair of KEF q900 and the combo is a killer combination. There is a lot of power too at 140 wpc. I had started with 3300 and then moved to 4300 and finally settled for 6300 for the extra wpc. However I am not still sure whether it justifies the high price tag. I have started to think I should have stuck to 3300 and may be added a power amp later. I am anyway not using the Zone2, Zone 3 and HEOS features yet and those were not the reason for me to go for 6300.
I use 2.1/2.0 for songs and 7.1 for movies. My subwoofer is very basic ( Polk Audio 10 inch) and I am not too happy with the sub woofer and an upgrade is planned. My plan is for a 7.2 setup.
I am sure there are experts in the forum who can suggest whether 3300 with a 2/5 channel power amp is a better option than going for 6300.