I got myself a Samsung SM2232BW / 22" Widescreen LCD Monitor and its the best one I have had in years, no complaints and a good price as well in my eyes.

http://www.play.com/Product.aspx?r=PCSH&title=3497022&source=9593

And back to your question; I would say its very handy to have two, have used two at work for years and its at well good home, especially if you work on webpages, coding or similar.