IPS matrix screens were kinda ok even in 2007, when I was selling them, but they had a super shitty reaction time, so everything had quite visible trails. That was the time when a good CRT was still a professional choice. But now, and for the last 10 years or so, IPS became much better, and kept their great color palette, so there are zero reasons to look elsewhere, a standard midrange monitor does the job. And if you want even less trouble, just buy a designer a used imac - that's an almost complete workplace, and apples retina screens are also IPS. This is what several development (mobile, web) companies I worked in did.
Well, you can go fancy and buy new ones, but the used ones are in abundance - rich mac fanboys switch to every new model that comes out