I'm looking to buy an external monitor for my 15" MacBook Pro and use it as the only display. Ideally the monitor would be 23-24" for the screen size and cost no more than $200. It doesn't need to have 4k or ultra HD resolution, but it should be clear and easy on the eyes as I'll be doing a lot of reading and coding. I already have a comfortable mechanical keyboard and mouse, but am unfamiliar with what's commonly used as the monitor.
I'm very happy with my refurbished Dell U2713H (27"). Same dimensions as the iMac, digital inputs. I see you can get a Dell U2414H (24") for $230.