I'm considering swapping out my Denon AVR-2311 as I've been a little disappointed with it's build quality and performance ever since I purchased it 8 months ago. I recently upgraded to some MA Radius HD speakers and a BK Gemini sub. I am yet to be fully "blown away" by the surround sound experience. Occasionally, depending on the movie, my setup produces a bit of a grin. But it's not very often. Treble sounds a bit too excited, quite a bit of sibilance in dialogue. The bottom end is better, the little BK is fantastic. But it's not just sound quality, the Denon feels plasticy for a £600 receiver. HDMI handshaking is sometimes flaky and the display looks like it cost 50p. So my question is, would a change to a Yamaha receiver be beneficial? I know the MA Radius/Yamaha combo is well tried and tested, but I thought the MA Radius/Denon combo was just as good? I've been looking at the Yamaha RX-A810 as an alternative. You can currently pick one up for £650 and my Denon 2311 is pretty much pristine so should get a good price on here. Would it be worth it or am I wasting my time? Any help would be most appreciated.