Obviously I didn't get it new, but an 2nd-hand Apple Thunderbolt Display i got for what would be like US$400 has been incredibly useful for me in my graphic des

Obviously I didn't get it new, but an 2nd-hand Apple Thunderbolt Display i got for what would be like US$400 has been incredibly useful for me in my graphic design work. Not only that it has the auto-brightness adjustment and the color quality is superb, but has speakers, camera, mic, ethernet and USB ports, which are a nice thing to have - specially the speakers and mic are pretty good. I can't care less about refresh rate but its resolution (96ppi) make it ideal for me - a nice spot between "old" 72ppi and not having scaling issues with a 4K resolution whatsoever. I got it to work with Linux with a HP Elitedesk 800 G4, a thunderbolt card they sell after purchase and the Thunderbolt3->Thunderbolt2 adaptor.