Well, I've had a 24 inch wide-screen for about a year and a half now. It was one of the best purchases I ever made. I get so much more done having everything on the screen at once, and it beats a multiple monitor setup hands down.
22 is almost as big and for $300 how can you go wrong? Of course keep in mind that it SUPPORTS high resolutions, but you'll need a decent video card to be able to use these without screen lag.
I suggest at least a 256MB video card which you can find now for around $99 almost anywhere.