If you’re desperate, right now I’d buy a nice Dell or LG non-Retina display with sRGB gamut, with the intention of buying one of Apple’s new Retina displays with Display P3 gamut in 2018 (or whenever is appropriate, based on your Mac and financial situation). Here’s my main reasons.

• If you have a 2016 MacBook Pro, you can use an LG 5K display. If you don’t have a 2016 MacBook Pro, Retina isn’t an option anyway.
• Choosing a display that’s not near 110PPI or 220PPI (pixels per inch) will likely mean you need to use display scaling, and that’s bad news for performance and quality. I’d go as far as saying it’s completely unacceptable for design work.
• You can’t buy Apple’s new display yet, but non-Retina displays are pretty cheap.
• Many tools still have issues running on Display P3 displays, and there is no setup change you can make that will fix it. Getting an sRGB display right now solves that, while the software issues get fixed.

Check out this great article from Bjango: Mac external displays for Designers and Developers. There's a chart with a handful of displays of various sizes, showing their PPI and their ideal design target (Retina and non-Retina).

Worth a look!

Also keep an eye out for Apple's "Pro" display coming sometime next year with the new Mac Pro.

I can't stand my thunderbolt display anymore. I spend the majority of time on my 5K iMac now, with the res set to native mode (the tiniest setting). Takes a day to get used to but now I can't go back..

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What Mark Edward said: Choosing a display that’s not near 110PPI or 220PPI (pixels per inch) will likely mean you need to use display scaling, and that’s bad news for performance and quality. I’d go as far as saying it’s completely unacceptable for design work.

I got a 4K display recently to replace my 24" apple Cinema Display. I thought, "higher resolution = better clarity". My Cinema Display was always a little fuzzy with font rendering, in stark contrast to my MacBook Pro Retina display. So I went and got myself the well reviewed 28" TN Samsung 4K screen. At full resolution, everything looks very clear but it's also incredibly small. Buttons, icons, windows, it's all really tiny so I end up having to upscale my display to end up pretty much right where I left off with my Cinema Display: slightly fuzzy. Not the best purchasing decision, if I'm being honest.

I haven't yet upgraded to a Thunderbolt 3 capable machine (running a 2015 MBP right now) but I am using an Apple Thunderbolt Display and I'm very pleased with it. I fully understand it's not going to be the same experience as a 4K/5K monitor or let alone the 5K iMac but I'm not working on those machines personally.

I'm plenty happy with the quality of the display as well as its color fidelity after calibration. It does just fine for me when working in Sketch, Photoshop or Illustrator.

I am very interested to see what Apple has in the pipeline (I had all but given up hope that they were going to still care about us Creative Professionals), but until that point I'm not at all unhappy with the performance of my 2015 Macbook Pro and Thunderbolt Display.

Surprisingly, after I've had to use a non-retina 27" iMac at work, I didn't find it that bad. (the display that is, the computer is a slow relic). It takes a day or two to get used to it and it's not that nice, but it's not a massive downgrade either.

I'm not advocating for the thunderbolt display, there are definitely better, cheaper monitors out there, but it's not such a big deal either.

I was using the iMac5K along with a Thunderbolt as a secondary display.

I found the Thunderbolt to just be hard on the eyes.

Recently, I picked up the 2016 MBP.

Despite the fact the LG hardware is ugly AF, I decided to go with the two LG 5K displays.

The resolution and image quality on the displays is awesome. I wouldn't go back.

Each display has a USB C out and both must be plugged into the MBP. Also, each display then has 3 additional USB C ports, which come in handy.

If you are setting up the workstation (bringing your laptop in and out) everyday, it can get annoying.

The two USB C plugs must be inserted into the MBP at nearly the exact same time, which can be annoying. Daily use, I leave the MBP closed and there is no lag on the displays at all.

Highly recommend this set up.

I was really down on the new MBP, but honestly, Touchbar gimmicks aside, it's a pretty awesome machine, and I'm glad I upgraded.

My set up:

Here's a good thread on it:

Designer News — Thunderbolt Display Replacement?

I've always found Dell or LG to be pretty solid and accurate for the price like Marc mentioned.

The Wirecutter — The Best 27-Inch Monitor

Didn't the Thunderbolt displays use LG and Dell panels anyway?...

iFixit's Apple Thunderbolt Display Teardown