Complete Gaming Rig For ~1400

Hey guys!

I´m planning on setting up a PC for gaming and just wanted to ask if the following setup is OK or if you have better suggestions:

CPU: Intel Core i5-6600, 4x 3.30GHz, boxed
Motherboard: ASRock Fatal1ty Z170 Gaming K6
GPU: Sapphire Radeon R9 390
RAM: Crucial DIMM Kit 16GB, DDR4-2133
HDD: Seagate Desktop HDD 1TB, SATA 6Gb/s
SSD: Samsung SSD 850 Evo 250GB, SATA
Monitor: Dell Professional P2416D, 23.8" (2560x1440)cCa
Case: Nanoxia Deep Silence 3, black
Keyboard: Sharkoon Skiller Pro+
PSU: Enermax Platimax 850W

The reason for the 850W PSU is that I whant to keep me the Crossfire Option open since I plan on using this setup for at least 5 years or so. But due to the higher resolution of the monitor sooner or later I will need a better GPU or Crossfire. I heard many negative things about Crossfire/SLI, but the ones who get it to work properly seem to have no regrets.

I don´t necessarily plan on overclocking, but maybe I will give it a try if needed one day.

The keyboard is not the best, but since I´m very happy with my Sharkoon mouse I thougt to just give them another try.

I hope to have provided all necessary information; sorry for eventual mistakes, I´m not a native speakter.
many thanks in advance

If you think you might overclock, then it would be a wise idea to invest in a CPU cooler. The Intel ones are fine for stock—nothing spectacular, but they do the job fine for the purpose.
Do you have an OS? If not, factor that in.

The OS seems to be kind of a trouble in terms of installation. I have a windows 7 home enterprise disk and plan on installing this and then upgrade to win 10. for USB-installation a patcher would be needed, but as for the disk installation the information wasn´t distinct.

Also is overclocking with a non-k CPU possible? There too I found different answers on the net.

You cannot raise multiplier so for overclocking K models are much better. I also would avoid TLC drives, like Samsung 850 Evo. Samsung already have two crap TLC models (840 and 840 Evo).