Having just sent back a faulty Sony WD653 I need a quick replacement. It will be wall mounted in my bedroom. It's doesn't need wide viewing angles but I would like 4k for future proofing, low input lag for gaming, good contrast for low lighting and I use it most of time as a PC monitor and watch everything from 1080p films to ancient tv shows. 50" is about as big as will fit in the space. I am utterly bewildered at all the jargon and choices available. I was looking at the Sony 49XE8004 on Amazon out of laziness and brand loyalty but the reviews don't seem too hot. Any recommendations would be much appreciated. Thanks!