We've been using with great success the 40" Philips BDM4064UC monitor. It is 4K and it is terrific for writing software. You can have a huge number of terminals open which is just great. The price is quite high. About $800 and now about$700. The other thing that is great about that monitor is that it does not chroma downsample so you get a true 4:4:4 which is nice and it runs at a true 60 fps if you use DP 1.2 (which you need to set in the control panel) or HDMI 2.0. It uses a TP Vision panel meant for TV, but it is nicely equipped.
The only issues we had with it are the flimsy stand (but you can get a 200mm x 200mm Vesa plate and a $99 Amazon Basics monitor stand and that is fixed) and it uses a BGR pixel layout, so on a Mac, the letters are big fuzzy. It also uses PWM so it can bother some folks. But since it is a VA panel it has incredible contrast of 5000:1 but off angle doesn't look as good. It also needs color calibration out of the box as it is quite blue, but this doesn't appear to bother "normal folks" (although I see it :-). The recommendation is to go with • Brightness= 72 (according to preferences and lighting) • SmartResponse= Off • Gamma= 2.4 • Color= User Defined • R= 100 • G= 95 • B= 77 • DisplayPort= 1.2 Now they have a new model at 43 inches BDM4350UC with an IPS panel at the same initial price point of$800 and it gives you a little more size and the switch to IPS and it adds a USB 3.0 hub as well for those of us who want our keyboard and mouse connection and potential an ethernet too) to snake along with the video cable.
Also the adjustment is pretty close at the default, just back off the brightness a bit.