I'm planning to upgrade my monitor to a 22" or a 24", but my budget lies around $300. I know there aren't many good 24" that are that cheap, but who knows! Anyways I included the 22" because there are some good deals out there.
I would also like to ask if you do recommend a monitor, please state why? What made you chose that monitor? This will allow me to gain some new knowledge and possibly help decide between the different monitors people will recommend here.