The way you have it should be good for all the games you mentioned (in 4k) except for maybe GTA V and Fallout 4. As for CS Go its better to have a monitor with a faster refresh rate (120hz+) but since FPS aren't the games you'll be primarily playing, you're good. In my experience gaming at 4K is amazing for the first 10-20 min. and after that you don't even notice unless you are looking for it. Personally I'd go with the (1440p 144hz) Acer Predator XB271HU ($769.99) and a MSI GeForce GTX 970 Twin Frozr V ($295.00). So you get an ips display for color accuracy and the lower resolution will be easier to run games at 60 fps while recording. You also wont need display scaling for windows which will be necessary on the 4k 27in. If you're set on 4k then go for it. Watching a 4K video on a real 4k screen is impressive 100% of the time, especially on an ips screen.