I might say that buying the best monitor that you can afford right now is always the best choice right now.
IIRC, I chose my 25" at QHD because of the noticeable improvement in resolution over a cheaper 25" at HD (my MBP will not drive a 4K). I absolutely appreciate this choice every day that I use the monitor. IIRC, I also realized the break point to go to 4K would likely be at 27". Better said, the break point to forget about resolutions at or below QHD is with a monitor size of 27". Finally, somewhere, you should be able to find out how to determine the pixel/inch values and do a cross comparison. By this I mean, the resolution of a 1080p at 24" is equivalent to a QHD at X inches is equivalent to a 4K at Y inches. You might want to calculate whether either X or Y is smaller than 27". So, depending on how close X is to 27", you will end up with a monitor that is just fractionally better in resolution than the 1080p you find so difficult.
Just for fun, I did a search and found this page compares images at different gamut values.
After reviewing this Website, as a non-professional hobby photographer, I’d be hard pressed to push for me to buy the less expensive higher gamut lower resolution monitor over the lower gamut higher resolution one when I could afford either one. Otherwise, I’d take the notes from @bowline about true photo-editing quality monitors to heart.