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I don't think 4K monitors are quite ready for prime time yet. Unless you specifically need 4k resolution for something, I would recommend going for an 1920x1200 IPS display. Dell makes many excellent displays, especially their Ultrasharp line. As long as you calibrate the display, you'll have excellent performance. If you really do need a high resolution, you can easily hook up 3 of these monitors in portrait mode for near 4k resolution (3600x1920). Their 60hz limitation might not be a problem for photography, but can become a big problem when used for gaming (arguably the best source of 4k content). Do you have a specific purpose for getting a 4k monitor or is it just because you can? If you want it because it's the bleeding edge, I really would suggest waiting for the next iteration. If you want truly exceptional contrast and money is no object, Samsung's AMOLED displays cannot be beat.