I was thinking of going to a 24" but I can get a pair of 22"'s for the same price as a 24" Dell. I don't much care for this Dell I have, it has a grainy texture that almost looks like a tiny fresnel pattern, it also makes images with a lot of white look noisy to my eye.
I have calibration gear and the PC is used for editing only as I have a few media PC in the lounge for anything else so hopefully colours should be well represented on screen.