I have two of these monitors that I have used with Mac minis (intel), a Mac Studio and a MacBook Pro (which I am using right now). I did have the 27" 4K version of this, but I ended up giving it to my daughter because I actually preferred the smaller 24" 4K monitor scaled to 1920x1080. Although not the 219 PPI of the 24" iMac, its 185 PPI is still very nice and crisp.
Seeing is believing with the LG 24UD58 4k UHD monitor. Whether your playing games, watching movies, or just reading from your screen, the 4k UHD display provides stunning images at four times the resolution of standard full HD. The 24UD58 works hard, but plays hard too. With a host of gamer frien...
www.amazon.com
Right now I see it is around $300 for the monitor - but I have purchased these before for under $250.
If I end up getting an iMac (I have always said I wouldn't again, but I like these M3s and really like the displays), I'm thinking of getting the VESA mount version and using it with one of the LG 24" 4K monitors on my monitor arms.
The only thing I am wondering is if the 4.5K iMac's effective resolution of 2240x1260 will match close enough to a 4K display with an effective resolution of 1920x1080. I have been used to using identical dual displays for so long, that I don't know if that small difference will throw me off. I am already prepared to be thrown off by the difference in display quality, despite my current 4K LG monitors being quite good once adjusting its settings.