TFT screens have colour/saturation shifts if you are not looking at them straight at 90 degrees. By the way the early flat panel iMac is the worst I have seen. Add to that that it is SO easy to adjust...
I found that when doing critical colour work I tend to unconciuosly adjust my viewing position to compensate for subtle image quality problems. This is quite frustrating because nobody sits in front of the monitor as a statue. This negates the whole system calibration troubles. CRTs do not have this problem at all.
We have 20" Apples, 21" Viewsonics and Philips' CRTs. I use Mitsubishi 22" CRT for general programming work but have 19" Samsung 191T at home. That was the best 19" TFT I could find. It is actually quite easy - in any local shop where they have dosens of them turned on sitting next to each other on one shelf just stand back, watch carefully and duck - you will notice the change in image quality. At the time this Samsung was the best in that respect.
I have to admit though that TFT is probably the best overall choice for typical user but the margin is not big at all especially if you compare within the same price range.