There's also the new Samsung 27" ViewFinity S9 5K. The list price is $1600 but Amazon has it for $1300 in the U.S. I've heard mixed reviews, particularly about how smoothly it works with Macs.
Signal integrity and all that sure, but really it's just a freaking monitor.
Plugging a monitor nowadays will always work. Of course, buying a new monitor only to have it fall back to a lower-quality compatible mode is unacceptable, but that's what happens in today's world. Monitors are more varied than ever. A 1080p60 monitor will work everywhere, and all monitors will accept such a signal. But we all love fancy toys.