[Klaus]

There are, of course, many excellent monitors beyond just Dell Ultrasharp - LG, Samsung, and Philips have great products (if you avoid the cheapest). And at the high end, there's Eizo.

I'd say a good rule of thumb is a statement regarding the DCI-P3 >= 90%, IPS/VA, 400cd/m2, 1500:1 contrast and yes, 4K.