My understanding from watching @Andy_Astbury1videos is the ideal PPI is between about 90-110, which usually works out between 0.2 and 0.3 pixel pitch. Above or below that can appear under or over sharp, more exaggerated the farther away you get. I’d be interested to hear what others think about this.
Assuming 16x9 aspect ratio:
For a 24" monitor, 1920 or 2048 pix wide.
For a 27", 2560 pix wide.
For a 32", 2560pix wide.
Sharpness also depends on quality of vision, and how close to the screen you sit. If you have great vision and/or sit close, your eyes will be able to resolve higher detail, thus noticing more difference with higher res screens. If you have poorer vision and/or sit further back, your eyes will resolve less detail, thus noticing no difference with higher res screens. For a 19" inch screen like yours, assuming you sit about a metre away, there should be noticeable benefit going up to 1920 pix wide (1080p), unless you have very poor vision. But unless you have above average vision, you wouldn’t notice much or any difference going above 2k.
16.7 mil colours is 8 bit per channel, and standard for most consumer level monitors. It will be fine in 99% of scenarios. Having 10 bits helps ensure any banding you see is in the image not the monitor. Many low end pro monitors have 8+2 bits, which means they are 8 bit monitors plus 2 bits dithering. In my research true 10 bit monitors (no dithering) cost an arm and a leg. So for most, colour accuracy is a more important consideration. If you go with a 10 bit monitor, make sure the GPU can deliver it.