I've been having screen resolution issues with my Retina MacBook Pro and my NEC 27" 2690 monitor via apple dual link adapter.
After speaking with tech support I learned that a new 27" monitor will be soon out. Out now are the 24" and 30" versions. Here is an example incase anyone is looking to update.
http://www.necdisplay.com/p/desktop-monitors/pa242w-bk