1: The higher the Resolution = the more expensive the parts you need to hit the desired graphics settings.
ex: Rtx2060 is fine for 1080 gaming but not so good for 4k.
2: All depends on the monitor here. IMO a really good curved display is very sweet but also very expensive. The cheap curved ones are a No! for me.
3: The higher the resolution then the bigger the monitor you want. Getting a 24" 4k monitor will have you scaling to 200% cancelling the purpose of getting a high res monitor in the first place.
4: I'm thinking my next montor(s) will be 27" maybe 32".
5: Size matters IMO. Whats the use of a 32" curved monitor if the display panel is only 9" high. No thanks, I'll stick with my 23".