For the features you're looking for, I'd highly recommend the LG C4 OLED TV. It comes in both 55" and 65" sizes and ticks all your boxes: 4K resol...
If you want to invest in the latest technology and ensure that your system is ready for future devices, a WiFi 7 motherboard might be a better choice.
I also use OWC dock station, love it.
All these motherboard brands are OK, personally, I love ASUS better.
A 850w PSU is enough.
Just wait Ryzen 9000 series CPUs released, then 7000 series CPUs will get a big price drop.
Corsair RM850e - a bit expensive than $100, but it worth it.
I use Thermal Grizzly Kryonaut, never has any issue.
In the Q4 of 2024, likely in September for high-end models first (RTX 5090, RTX 5080)