What's the best solution, right now, for these silent upgrade mac minis?
It's all in my table in the first post.
The safest bet for all Minis is any 17" or 19" display. If the color stability over longer period of time is important, then look for display in that range with LED backlight. My personal favourite is Fujitsu B19-7. Not the largest gamut in the world, but for non critical work (high end photography, pre-press) it is very nice.
For larger than 19" sizes, consult my table or ask other users.
As to the Apple displays, those with CCFL backlight, if they were used extensively, might be faded out and not reproducing colors correctly. The same also applies to other displays with CCFL backlight.