They are okay for this kind of use.
Here's an Eizo office monitor for $500ish. It's a 6 bit IPS type, but a lot of them are in that price range. Their dithering algorithms are actually quite good.
The NEC 23" might not be quite as good as their 24" of similar type, but it includes some of the features to improve uniformity that you find on the higher ones. In cart B+H charges $498. You can find the old model directly for $450 closeout. They have some of the standard office NEC displays for less. Those vary a bit. They aren't always flawless, but they are actually more consistent than Apple imo. It's also a brand that is largely focused on displays. A U2412m wouldn't be a bad buy. I think it's another 6 bit type. I'm partial to Eizo as I've had good results from them using the CG displays.
Apple displays typically aren't the best value. If you do decide to go with Apple displays though, get them in the same order. That way you can apply applecare to both through the purchase of the mac pro. Most other displays have longer warranties. NEC has a 48 hour replacement. They and Eizo are known more for professional displays, but they make ones intended for office use as well.
