I'd check what year your display is and find who made them that year, I have never used them but many say HP color dream is superior to Thunderbolt. As for me I worked on a 27 Dell Ultrasharp and I loved it, the matte display was much more comfortable to my eyes than the glossy Apple display, but that's personal preference. Asus also makes good displays and the new 4k monitors are sure to be beautiful, only problem is pushing that many pixels with a laptop.
I'd check what year your display is and find who made them that year, I have never used them but many say HP color dream is superior to Thunderbolt. As for me I worked on a 27 Dell Ultrasharp and I loved it, the matte display was much more comfortable to my eyes than the glossy Apple display, but that's personal preference. Asus also makes good displays and the new 4k monitors are sure to be beautiful, only problem is pushing that many pixels with a laptop.