Best monitors for colour are CRTs.... I guess you don't want one of those tho!
We use apple displays for colour, although they don't do the matte finish anymore, so we also have Some of the pro NEC multisync ones.
You should be looking for a resolution no less than 1920x1080 and a high contrast ratio. Saying that some of these monitors have a high contrast ratio but still have a crap black, they just have a high white point.