Best monitor out there?

I just bought a UD590, have tried to calibrate it and unsuccessfully at that. The monitor is a 4k monitor, so the number of pixels is amazing, though color representation and viewing angles leave something to be desired, as blacks are not very good, and there is like a white hue on the monitor when I turn the lights off and have only that active....

So I though I would ask the tribe which monitor they though was...

  1. The best
  2. Talk about 4k monitors
  3. The best monitor for the cost

I would like to get a QHD or UHD monitor, and am currently using a SP2 to power it, though in the future might either build a gaming rig or get a razer blade 14inch.

I really appreciate any input.

The UD590: