For what it's worth, I'm using the Eizo CG243W on the left for Photoshop, which relegated my Apple Cinema Display 23" monitor to the right, used for less color critical viewing.
I considered the 30" option and other manufacturers, as well, but what settled me on Eizo were three things; their reputation for excellence, the fact that they are the default choice for
professional editing in many shops, and the belief that if they screw up color, they're toast. If some of the other players screw up color, it's a small part of their corporate product line.
I've been very happy with my choice, and the dual monitor display. Good luck!