I finally picked up an
Acer XB271HU 27" / 2560 / 144. It was much more expensive but it has no QC issues, so I'm happy with it.
By default it had a slight yellowish tinge out of the box, and all the OSD settings I tried online just made it worse. Finally I used these:
http://www.tftcentral.co.uk/reviews/acer_xb270hu.htm#calibration
Apparently the panels are similar, and these made it look practically like my old Dell, which is good.
I also like how it can display the refresh rate or an aiming cross-hair on-screen, which is really useful for some old games.
I just finished configuring my entire gaming library with new settings, and 59/61 are running under 144Hz just fine. Doom 3 does 120Hz, but Serious Sam classic is stuck at 60Hz, so that's a great result overall.