I recently purchased a HP ZR22w.
http://www.amazon.com/HP-ZR22w-21-5-inch-S-IPS-Monitor/dp/B003D1CFHY/
The quality isn't MUCH worse than my 6 year old 20-inch Apple Cinema Display, with the benefit of having about 15 percent more pixels. Tiniest couple more pixels in the height to make it HD as well a more significant width increase being 16x9. It gives me a bit more "room," on the desktop.
I hate having anything but Apple displays, but Apple makes so few now. One.
This display is pretty good. It is NOT LED backlit while cheaper models from HP were LED backlit. I often find problems with the LED backlights and actually wanted a more traditional display like my old Apple Cinema Display 20 inch. Some of the reviews on Amazon echo this, that they didn't want LED.
Now, for the 2011 update to this display that is hitting stores now, adds a 44 somewhere in the model name, it will have LED. Therefore, I'm skeptical it will take a step back, but who knows.
I sure wish Apple made a larger variety of displays, and I wish the displays in iMacs didn't have their issues (I blame LED in them for some of the problems).