for the graphics card It really depends on if you like opencl or cuda aceleration. AMD is king in open formats however if you want Cuda then all you can go with is Nvidia. I use Adobe Premire Pro for my video editing and it works best with Cuda acceleration. as for the processor it really depends on if you are doing multiple things or not. I use the 1700 myself and it works great. but you will want to overclock at least lightly. core speed is more important than core count with most programs.
For ram Trident Z or Geil works well and you will want the fastest AMP profile you can get up to at least 3000 mhz with the infinity fabric gaining more from faster ram than higher core speed. there has been some issues with 3200 MHZ ram but 3000 seems to be the sweet spot from what I have heard.
In regard to the cooler if you have the ability to overclock then by all means do it. the wraith cooler is very well made however i have noticed that with rendering being how it is you may want an after market cooler to keep the temps down if you overclock.
As for the the additional parts i would suggest a ssd to use as a scratch drive. with editing video especially at 4k you will want a beefy graphics card. At least a 1070 or R9 390. The RX versions other than vega were more of a mid teir graphics card. i know from personal experiance that the R9 390 can easily handle the 4k video i have thrown at it. but as i said it all depends on if you want Opencl or Cuda