I'm sorry but I have to disagree with everyone suggesting a different monitor. I purchased a 3rd party monitor to do go with my Mac pro and I wound up selling it and using the $ to invest in an Apple Display. It's the best investment I ever made and here's why.
1. Color
2. Brightness
3. Vividness.
4. It matches (not the most important but hey.. it's true)
Now.. can you get the same color on the other monitors.. Sort of. I found that i had to fingle with my dell monitor for weeks to get the same colors that I saw on monitors at the Apple Store. I never got a great Gama/brightness setting.. it would literally hurt my eyes looking at the thing. I would have to invest an additional $150 to buy a calibrator to really get it right and wouldn't you know that was just about the price difference of getting an Apple Pro Display. I sold the Dell Display (tried the same thing on a Samsung Diplay too.. so I know it wasn't the monitor) and purchased and Apple 20 inch Refurbished display. Out of the box it looked Immaculate the first time I turned it on. You only have one button to worry about and that's the brightness. Color, hue, baland, Contrast.. everything else is perfect.
My case in point is.. it's not just that the Apple Monitors match.. it's so much more. The monitors as specifically calibrated to the Mac Pros and the video cards that ship on Apple's computers. I you want good colors/brightness/contrast on just ANY LCD, then you're also going to have to calibrate it out of the box. Trust me.. It's worth the extra dough.
Apple always insures that the color matching on their monitors is superb.
Nevertheless, the current LCD's from Apple are grossly overpriced. I waited it out for two years waiting for some movement or advance and it never came.
As I sit here typing this I am looking at my Cinema Display and my Dell side by side and the Dell is better.
I will say that the Cinema Display was much easier to calibrate, but even when factoring in the cost of Pro calibration and the extra time, it still did not add up to buy a Cinema Display.