Here’s a deal that may appeal.
Normally for my professional clients I recommend the NEC PA322 UHD wide gamut display with color calibration (SpectraView II software + hardware). See the 5 page review of the NEC PA322 UHD. But the price is a bit steep for most users (about $3045).
MPG has also tested the LG 31MU97-B 4096 X 2160 4K Display and it is a very nice display too, supporting most of the AdobeRGB color gamut.The LG 31MU97 works on the 2013 Mac Pro and late 2013 MacBook Pro models onward. It offers a very enjoyable viewing experience.
B&H Photo has the LG 31MU97 for $1175 ($225 off, add to cart for the reduced price).