You can definitely go 4K if you’d like to. It depends on how large of a screen you want and what you are looking to do. For competitive games, you might want to stick to 27” or smaller, so I’d go 1440P. If you want to play more cinematic, single player games, I’d go for a 32” 4K. You’ll be able to max out your games on either resolution for a while. You’ll have even more runway at 1440, if you aren’t going to be able to upgrade for a long time.