1920 x 1080 is fine for 21.5", though.
They are nowhere near when it comes to colour accuracy.
Here's the one thing I don't understand about the color accuracy thing. If we went and got 20 peoples pc monitors and put them all side by side, they would all look different. Everyone on earth would have to have the exact same monitors, with the exact same settings, being used in rooms with the same lighting for the screens to looks the same. There are to many variables that effect color accuracy to really worry about how perfect the colors are.
Say we all had our monitors set exactly the same, and the colors all looked identical, then if we were editing and printing pictures, we would all need the same printers, with the same brands of ink in them to all get the pictures to look just like the one you have edited and printed.
You honestly can't believe that because you spent 1000$ on a mac display that, the video, or picture you edited, is going to look the same on everyones monitors that look at it, as it does yours.
As far as super high res being overrated. It is until you get into projection sized screens. Like I said before. I compared the same tv's, one the 1080p version and the other the 720p version, bought on the same day, side by side, with the same content, and no one at my house could tell witch, tv had the higher res. If the 7 or 8 people I had here couldn't tell the difference on a 50 inch tv, then it's hard for me to beleive than anyone could tell the difference on a 27 inch monitor.
Anyway, I just couldn't justify telling someone to buy a 1000$ 27 inch monitor, because of color accuracy. It's really not as important as you are making it out to be. To many people, have to many different types of monitors, tvs settings, printers, lighting conditions, etc. Yours might look great on your monitor, then you edit some video, or pictures, and everyone else that sees it thinks it looks washed out, becasue you are doing it in a dark room, while they are setting outside looking at it.
As long as the colors look good, and are not off, then it has just as good of a chance looking perfect on this printer or monitor, as it does that one.
When it comes down to it, it's obviously personal preference. But to claim that the color accuracy is what makes someone spend 1000$ on a 27 inch monitor doesn't make sense to me, because of all the variables of everyone else viewing the material that you have edited. If monitors were so much better, why wouldn't they make tvs like that? Don't say price, because when plasmas came out they were 10,000$ for a cheap one, and people bought them.
How about this? Send me a picture of something simple that everyone has in their home. I will edit the color to match it as closely as I can to the real thing, you do the same. We will post the pictures and ask which ones color looks the closest to the real thing? It could be a can of coke. Everyone in the world has coke products where they live. Either you or I can take the picture, or you could even pull it off the web. Send me the pic, we will make a poll thread asking and see which one has the most accurate color. I'm pretty sure that because you have a 1000$ 27 inch apple display, and I'm using a tv it won't make a difference.