oudmaster :
great info thanks,
so better is to play next two years on full hd monitor and ultra settings and then wait for a better solution for 4k resolution !
I think most of the suggestions were to choose QHD (2560x1440) for now. Full HD is only 1920x1080.
These are pretty much your options (my examples are all 27 inch monitors):
1. 1920x1080 monitor, 1 to 2 ms response time, 120 Hz or 144 Hz refresh. This is the best option for reduced motion blur and input lag. These use a TN panel which has faster response time but picture quality and viewing angles are not as good. Examples Asus VG278H, or VG278HE, BenQ XL2720T or 2720Z. You can also get 24 inch versions of these monitors which will look better because of the smaller pixel size, but the screen size is smaller too of course.
2. 2560x1440 monitor, 5 to 8 ms response time, 60 Hz refresh. This is the best option for picture quality. These use an IPS or PLS panel which has better image quality and viewing angles, but slower response time. Examples Asus PB278Q, Dell U2712HM.
3. 2560x1440 monitor, 1 ms response time, 120Hz refresh. Similar to option 1, but higher resolution. Asus PG278Q is the only example currently, and this is due to be released in the next couple months. They claim a high quality TN panel. You can expect much better image quality than option 1, but maybe not as good as option 2. Benefit over option 2 is reduced motion blur and input lag.
4. 2560x1440 IPS panel over clocked to 120 Hz. Claiming to have the benefits of option 1 and 2. None are available from major manufacturers. IPS panel still has slower response time so 120 Hz is of questionable value. None of the review sites have done a thorough review on picture quality. I think these are best avoided.