My only comment is that if you have space, consider a full tower with LOTS of spots to add case fans to blow air through the case
I have had mid tower and now use a full tower which makes installing everything much easier
-reply #6 for my hardware list in https://forums.adobe.com/message/6536849
the i7-6850k is the 40 lane 6 core, are you asking about the 8 core i7-6900k? its over 2x as much money, but only 20-25% faster. it and the 10 core are on the expensive side, only for those that can justify the time saved vs money spent. premiere is still very much a cpu bound program, odds are you would see a benefit in performance with the 8 core or 10 core cpu, even with a single video card. some people that are working with raw video and doing lots of gpu based effects, might need a second gpu to help with performance.
the samsung 950 pro is largely wasted as a scratch/cache drive. its best use is for a media drive, for larger bitrate video files. smaller bitrate files will be fine on a samsung 850 sata ssd. if you already have the samsung 950 pro, you might want to see if you can load current premiere project Sony AX33 media on it, and then when done move the files to the backup drives.
you can put all cache/db/scratch on the samsung 950, or choose to leave part on the os/apps ssd, as there should be enough performance left on that drive to handle some too. any automatic backup saves should be set to another drive than where you are saving your working project, to protect against a drive failure.
the case you list should support several fans, i think even two 200mm. it should be more than enough air flow for the hardware you list. if you are worried about it, you could also look for a blower style gpu for the gtx 1070. something that looks like the white asus turbo gtx 970 or reference/founders edition nvidia cards. these exhaust the hot air of the gpu out of the case, but can be louder as they have only one fan.
Thanks for the reply.
So you suggest that I put my current video files in the Samsung 950 as well as the scratch files? Won't that hinder performance if they are both in the same drive? What if I put the video files in the 950 and the scratch files of premiere in the 850? Would that be better?
it shouldn't make much difference either way, since both the os/apps drive and 950 pro should have performance left over to handle cache/scratch. if you don't have enough room for media and cache/scratch on the 950 pro, you can place cache and/or scratch on the os/apps drive (850 pro).