Use CAT6 or even 6A. CAT8 is the latest standard, but it’s probably too expensive?

Also consider running fiber optic between floors as a backhaul since 10G fiber switches are cheaper than cooper ones.

Cameras are fine on 5E, but may as well CAT6.

Run multiple random ceiling drops for APs and other home automation devices / sensors.

The LCD one is fine in my opnion, the screen isn’t enough of an upgrade to justify buying a new one. If only Valve upgraded the CPU too.