What you probably need is a screen you can use with default 100% scaling, especially since only 3dsmax 2017 supports proper scaling anyway.
For me personally pixel size (Dot Pitch) of around 0.233 is fine. That's about what you get on 27inch 2560x1440, 34inch 3440x1440, 40inch 3840x2160 screens as an example.
I personally find 4k on anything below 32inch useless. The moment you use scaling, you loose effective screen workspace, so all those pixels do is increase sharpness and tax your GPU more.
But I'd still stay away from 40-43inch monitors, as all currently available models suffer from various problems. I myself bought a 4k 40inch korean one, but should have gotten a 34inch ultrawide instead.
Which is what I ultimately suggest - get two 1440p 27inch ips monitors, or a 34+27 ips, or even a single 34inch for now. There are many models with great quality and acceptable pricing. 4k just isn't there yet, as you sacrifice something even when paying a lot.