Can anyone recommend a good monitor?

Bod

I replaced my 4k display with a QHD unit. 

Some developers still haven't got their heads round Windows scaling.  I was running an additional 1080 display alongside the 4K and some plugins were unusable while others had to be moved to the 1080 to work.  I've had an support call outstanding with Native Instruments for 2 years in which they've acknowledged there's a bug with Massive X, Guitar Rig 6, and any of their plugins with the new HiDPI plugin interfaces, but it still hasn't been fixed.

octatonic

I’ve upgraded this week, from a Dell, to an MSI Optix MPG 321UR-QD, for gaming performance under Windows.
It doesn’t make any real difference to DAW use.

I don’t like more than one screen, esp with larger sizes and it means your studio monitoring has to be too wide.