I have used both IPS and non-IPS over the years for web design and photoshop. My opinion…IPS may be better for the viewing angles but a good non-IPS will be just as good in terms of color.
I sold my 30″ IPS panel last year. It was a great monitor but the color white was never just right. I then bought a 24″ NEC http://www.newegg.com/Product/Product.aspx?Item=N82E16824002168
Greatest monitor I have ever used. I found someone on craigslist that was selling it…new $300. I have used everything… LG, Dell, Sony(CRT), HP, Samsung and I will say my NEC has really grown on me to top the list of them all…even not being IPS. However NEC is not cheap, but worth the money because they have the best warranty policy out there by far.