A list that may be of some help:
IPS Monitor List: Best AHVA, PLS & IPS LCD Displays
Also, read amazon reviews, PC site reviews, etc. on those displays that interest you.
Not many 5k displays out there, and all are pricey.
Lots of 27" 4k displays.
Seems to me a 32" 4k display would look strange running in HiDPI mode ("looks like 1080p").
You could run it "in scaled mode" for 1440p, but that would put a heavier load on the GPU and the fans might be likely to spin up often.
On the other hand, a 32" QHD NATIVE 1440p display would run easily...