Sticking with my 2010 vintage 30" ACD. It's still works perfectly well and I like matte. My only minor complaint is the lack of modern ports...old USB and FW ain't going to cut it too many more years. Related to that, it would be nice if those USB ports had enough power to charge my iPad.
My nMP arrived last week and migrating data was absolutely nightmarish but the bottom line was that for migration purposes I needed a second monitor so I ran out and got a 27" TB Display. I have to say after having used it for several days, I really dislike it. Despite the fact that it's the same resolution, I have to say that the real-estate size difference was immediately apparent. I like the fact that the TB display has more modern ports and a built-in camera but that's about it. If my 30" ACD crapped out today, knowing what I know now, I would seek a non-Apple branded display.