The Apple 20' is what made me move on from the Sony 21' CRT (now being lent permanently to a good friend).
Here is the real secret...
When brightness is turned all the way down, and when calibrated on OSX (with expert
mode turned off) for the -stock- warm yellow (10 second job). All three of the office ones are perfect. And this is based on 4 test images printed by a Sydney printing company, and held up next to the monitor at the right time of day.
Thats the funny thing about colour correctness... the time of day!
Also take note that with a CRT your best efforts at colour calibration are destroyed quite soon after you calibrate. If there is any magnetic interferance it will effect. If you move the monitor (say from north facing to south facing) all your calibration will also change. Receiving images from the northern hemisphere will also look different down here in the south if there are two identical monitiors at either end!!!
LCDs are a practical solution to many of the issues for CRTs.
No one will regret the 20'. Don't buy the 23' as we had one for a while, and its colours are not anywhere near as correct as the 20', so we brought it back. Even the 30' is better in this regard I have heard, but have not had the opportunity to test it yet.
For $1250 it has dropped in price almost 1/2. The only other LCDs that I would trust at the moment would be the Formac ones as they can be calibrated (the mac 20' doesn't need expert calibration as all 3 we have are almost identical), and the new Lacie one that I'm sure would be great, but at twice the price of the 20' I can't justify (except that it has this cool portrait/landscape swivel function).
I wrote this in a rush before work so I hope it isn't full of too much unnessesary raving.