Its a good question and one which is as important as the lenses you choose in photography. A good monitor will display your images correctly and provide that WOW factor we are all in search of.
For correct display of colour you either need an older Sony Trinitron CRT or a S-IPS panel. Don't be attracted by low refresh times of panels because its colour accuracy that is most important, does your photograph move? - NO!
I had a link to a panel decoder where you can enter the model you are interested in and it advised of the panel type and alternatives. I'll do a search to see if I can find it again.
Once you have your new S-IPS panel remember to calibrate it using a spyder of Pantone Huey - Very important as you are wasting your panel money if you do not.
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