PC Monitor Size

[Sebazy]

But like I said, I have to lean back into the chair due to injuries, so I don't know if the 20s would cut it for me.

You can get true 1080p 32” monitors quite cheaply, I don’t especially rate them but if you are leaning back then a 4K display is likely going to be a waste unless you go huge. Personally I’d recommend a 32” 1440p and a good monitor arm for the easiest all round solution.