the apple 20" display colour is excellent. very, very good. i think it's actually better than CRT's as it doesn't suffer from and distortion from the image being 'focussed' on the glass tube. colour definition is very good. 23" has problems, but the 20" and 30" don't suffer from this. the 20" iMac shares the same panel as this cinema display.
the dell FP2405W 24" HD display is also very good, will with brilliant colour and a very nice price tag.
for image work, make sure you get lots of RAM.
Dual 1.8GHz G5 2GB, 1TB, Radeon 9600XT 128MB, 10.5
20" Apple Cinema Display + Dell 2005FPW 20" dual-head
iBook G3 700MHz 640MB, 40GB, Rage128 16MB, 10.4, dying battery