I have 2 23" Apple monitors for video editing and playing Americas Army, and they are the best monitors I have ever used. I have used Dells in dual monitor setups, and although they are nice, they don't compare to Apple's monitors.
Of course, I am a Mac user that just purchased an Alienware, and I may be a bit Bias.
Anyways, best of luck with the new monitor search.
Apple, Apple, Apple!!!!!!