I'll add that you might want to stay away from "gaming" monitors, whose main focus is getting lots of pixels in front of you but not necessarily with the kind of quality you'd want to see when working with video.
I recently switched from two 27" Samsung HD monitors to a 5K/4K HDR combo.
If you're interested, the 5K is an LG
34WK95U-W 34"UltraWide 5K Nano IPS LED Monitor, while the 4K is an
LG 27UK850-W 27" 4K UHD IPS Monitor. The 5K requires a DisplayPort connector and a powerful GPU to run at 5120x2160, while the 4K can run on USB-C, HDMI, DisplayPort and just the embedded iGPU in Intel CPUs.
I also tried out the huge LG 49WL95C-W 49-Inch Curved 32: 9 Ultrawide Dqhd IPS with HDR10 monitor. It was amazing to sit in front of and the curve really helped keep everything at the same distance, but using it with PD wasn't practical.
The problem is that PD always starts full screen and I didn't need all that screenspace for editing. The Display Fusion app and macros I used to automatically resize it couldn't do anything about the poor alignment of the interal windows, and it was also hard to watch a full screen video since it always had very wide, blank edges. Also the vertical resolution was only 1440 so it couldn't display true 4K (3840x2160).
For me, these two monitors do everything I need.
YouTube/optodata
DS365 | Win11 Pro | Ryzen 9 3950X | RTX 4070 Ti | 32GB RAM | 10TB SSDs | 5K+4K HDR monitors
Canon Vixia GX10 (4K 60p) | HF G30 (HD 60p) | Yi Action+ 4K | 360Fly 4K 360°