It's not really a matter of CRT or LCD anymore. CRTs are dead in the water save old stock or really cheap crap. It's more of a question of getting a really good LCD. Of course the Apple Cinema Displays are at the top of the class, as well as high end Sonys and La Cie LCDs. Whatever the model, be prepared with a mitt full of benjamins if you want photo quality editing.
If I was buying tomorrow, the newest version of the Apple 23" Cinema Display is killer (just released a couple weeks ago). Besides the excellent display attributes, I like the compact aluminum case and onboard Firewire and USB ports. Of course the 30" Cinema Display is even better if you have the video card firepower and $1900 calms.