As a 1080p 21' monitor user, when I got my first Mac laptop seeing it's HiDPI sharp text I was instantly hooked. Thing is, I still need to do my work on a PC. So I started my search for a higher resolution than usual monitor.
Recently, Dell dropped s2725qs which is a steal at 300 euros. It's 4k 27 inch 120hz and 99% SRGB. I set it at 150% scale on KDE Plasma. It works well. Compared to Cinnamon where text was a bit fuzzy at 150% (fractional scaling duh...). Optimal scenario would be 5k so you can use 200%, hence no fractional scaling, but you can't complain at this budget. My eyes are really happy now. I love it. Speakers are surprisingly decent. 120hz is very nice addition, actions like scrolling or playing a game make it so enjoyable.
I know this is technically not a HiDPI monitor, since they start usually at 200+dpi. This Dell is 161dpi, but works for me.
If you have any questions, let me know!
I have a 28 inch 4k monitor specifically for my ps5, since i prefer 1440p ultrawide on the pc side, and the pixel density is definitely nice. For shits and giggles i tried to look as closely as possible at the screen and couldn't spot the individual pixels. Something i also like about it is that even games that don't run at native res still look like they are native when the ps5 upscales it. Either the upscaling is really good, or maybe it's just not noticable because of the smaller screen size. Either way it looks really good.