Aux portrait monitors

I might be upgrading monitors soon, and I want to put my secondary monitors in portrait. I've got a really odd set of requirements that are proving difficult to search for… suggestions appreciated : )

  • 1920×1200 (or ×1080)
  • ~ 20"

the size+resolution requirements are about being close to the same PPI as a 34" 3440×1440 primary monitor.

  • IPS (or comparable viewing angles)

IPS is about color, but mainly about being viewable in portrait mode.

  • displayport connection

displayport is about which type of connections most GPUs have three of these days.

  • VESA mount (75mm or 100mm)

Being mounted.

  • matte
  • black (and preferably slim) bezel; preferably minimal branding and no controls on the face
  • good quality, but preferably inexpensive

All this is just nice-to-haves. I'm not trying to make a zero-bezel sort of setup, not terribly picky about appearance of the case.

So far, I've found:
- http://www.newegg.com/Product/Product.aspx?Item=N82E16824025125
- http://www.newegg.com/Product/Product.aspx?Item=N82E16824236587R
- http://www.amazon.com/dp/B005LN1JEC/

…which would probably be acceptable if I couldn't find better.

Thanks, all, for your time.