I would have a 65" 4K hanging on the wall. Below it - on a TV stand - I would have identical 40" 4Ks. In the TV stand, I would have my AudioQuest power conditioner, my Marantz receiver, Xbox One, PS4, Cable Box, Switch (internetz), Apple TV, and a desktop PC. My configuration would be such that anything on the 40" on the left could also be displayed on the 65"; allowing me to toggle two shows back 'n forth during commercial breaks. The other 40" would have my gaming systems hooked up to it for dedicated gaming glory. My PC would be hooked into the same 40", but also be connected to the other two TV's (tri-monitor).
I'd have all of my equipment hooked up with at least 10% silver HDMI cables; high transfer speed, charged cables to ensure one-way direction of information, and best audio quality; probably AQ Diamond Cables. I would also have the 9 channel Marantz receiver hooked in with similar speaker wire: 1 center, 1 right, 1 left, 1 far right, 1 far left, two mids, two rears... and ATMOS speakers (minimum 4) in the ceiling. All of my speakers would have to be Bowers & Wilkins for the truest audio quality.
Next to my chair, I would have one remote to control most of the equipment (Harmony One, probably). Charging docks for my X1 and PS4 controllers and a keyboard (w/ mouse pad built-in) for PC control. This would be on top of my mini-fridge stocked with beer, red bull, and pop.