According to RTINGS, my TV can do about 630nits. That should be easy for a good quality IPS, QDLED, VA or Mini-LED TV.
So I would try to get a display that can do at least that or if not very close to that.
Since you’ll be buying a new TV, if you’re not going for OLED, you might as well try to get something with an RGB Subpixel Layout.
Another thing you might look for would be VRR/GSYNC/FREESYNC and at least 120Hz refresh rate with BFI.
My TV doesn’t even have most all of things and I have a pretty decent experience but you might as well get the most you can when you can.
You can also try to determine the optimal screen size for your room and viewing distance.
There are resources available on the internet to help you to determine all of these things.
Also, make sure your display can do RGB 4:4:4 Full at 4K at your maximum refresh rate.