As a mac user, I don’t know anything on the PC end that equates to an Apple Cinema Display, but that is the lowest end I would go for getting a good gauge of your color. But I do not do color work on these monitors as they are extremely unreliable. I’ve compared both NEC PA302W and an EIZO CG276. I find the difference between the two to be unremarkable, with the NEC being a few hundred dollars cheaper. You can, of course, go smaller than the 27/30″ and save even more. With proper calibration your color will improve vastly. Or you can save a little over a grand and go the cinema display route and still have pretty decent color. Better than what you have now.