Yamaha RX-V1800
Pioneer 428xd
B&W 601 S3 fronts
B&W LCR 60 S3 centre
REL Quake Subwoofer
B&W M1 rears
Looking to upgrade my Yamaha to an up to date receiver that will handle 4K. Sky Q is coming and a new TV wil be purchased soon enough. What I want to know is how much can I get away with...