Looking to upgrade from my Yamaha RX-V777 to a new amp to include 4K and 7.1.4 capabilities. I'm running all Dali opticon speakers in my current 7.1 set up with the large 8 floorstanders at the front (with poweramp), plus a BK Monolith sub. I'll be getting Dali Altecos for the height speakers. I use the system mostly for cinema and my room size is approx 6m square. I feel I should probably stick with Yamaha and am considering the RX-A3070, which should be more than capable and a good upgrade over the 777. However during my research I have come across several posts mentioning the Arcam AVR550 and what a significant upgrade it made to other users systems. My budget can run to the Arcam, but only if it's worth the extra £1k in terms of sound quality. Obviously I'll need an additional poweramp to run 7.1.4 but thats not a problem as I have spare ones. I know Arcam are highly respected and make audiophile quality kit, but I am keen to hear from other Arcam owners and their opinions. Any advice much appreciated.