1. There is large variation in TN displays. I'm very happy with the Acer TN panels I have at home. I find good TN gives me less eye strain than a lot of the IPS panels. IPS is the way to go for photo editing and similar tasks which require color calibration, but for coding, I actually prefer a good TN panel. Again, the trick is to find the right one. Try them at a store, for example.
2. Consider getting one 4k, and keeping the 1080p monitors. I have a 5 display setup like that. It works pretty well, actually. The 4k is great as a main display, and all the auxiliary stuff lives on the 1080p panels.
Right now I have an Acer 4K TN as my primary screen and it's extremely difficult to work with. And keeping the three HD displays I have around it is also problematic... the resolution difference always destroys the illusion of working on one seamless desktop... and the viewing angle has me need to turn the HD displays around and rotate their output so I'm "viewing them from above" ..
1. There is large variation in TN displays. I'm very happy with the Acer TN panels I have at home. I find good TN gives me less eye strain than a lot of the IPS panels. IPS is the way to go for photo editing and similar tasks which require color calibration, but for coding, I actually prefer a good TN panel. Again, the trick is to find the right one. Try them at a store, for example.
2. Consider getting one 4k, and keeping the 1080p monitors. I have a 5 display setup like that. It works pretty well, actually. The 4k is great as a main display, and all the auxiliary stuff lives on the 1080p panels.