Which is the best 24 inch external monitors for new M4 iMac?

I'm currently using a 27-inch iMac from 2017, and I'm planning to purchase the new M4 iMac, which only comes in a 24-inch size. As a result, I'd like to add a second monitor to the iMac -- but similar in size. So I'm looking at 24-inch monitors.

Does anyone have any recommendations of a monitor that will work well with the 24-inch iMac?

Thanks!

[Re-Titled by Moderator]