Just bought a new monitor myself and went through alot of research for it.
https://www.omnicalculator.com/other/screen-size
I used this calculator in comparison to try and get a feel for screen real estate.
I had been using four monitors with an older 30inch 2560x1600 as my main with some inverted side monitors and one 24" wall mounted on the top.
My new monitor is
Dell 27" 2560x1440 (S2721DGF)
Other monitors I considered were
Gigabyte 27" 2560x1440 (M27Q) - comparable to the one above in value rating, slightly cheaper, but in my opinion stuck with the Dell because trust the brand more.
Gigabyte 32" 2560x1440 (M32Q) - same monitor as above but larger size obviously. Unfortunately they do not offer this monitor in my country.
I'm considering buying another one in eventually months weeks:
Gigabyte Aorus 32" 2560x1440 (FI32Q) -same monitor as the 32" gigabyte listed above basically but with a apr $200 steeper price tag with only a few additions. They do offer it in my country though.
I'm loving the Dell I bought so far. I like it better than my older slightly larger older Dell. All the monitors listed above have IPS panels and run at 165 Hz speeds or greater and from my research I think you are getting much better value from them than some of the 4K monitors around the same size. I know it's spoken about here that the refresh rates don't matter as much for poker but I love this monitor regardless and just want something to keep up with future tech overall. If I add another monitor down the line I think it's going to be a slightly larger monitor like the ones listed above and invert or put this current dell on the side.
Maybe someone with a 4K can speak up for why they think they are better but personally I think the 2560x1440 monitors offering the best bang for your buck on quality and performance.
https://versus.com/en/monitor
https://www.youtube.com/c/Hardwareunboxednow