This is a professional workstation utilizing professional parts. You get 16 cores, 32 threads, 32 gb of ram with the option to add upto 512gb of ram, and a pro GPU which has better driver support, color depth and accuracy compared to a gaming card.
PCPartPicker part list / Price breakdown by merchant
2x 8 core xeon processors will give you maximum editing and rendering performance
This is designed to fit on server mobos and is quiet
Dual socket server mobo ...
32gb
ssd for apps, hdd for files
k4200 will benefit you when utilizing pro application because of better driver support and color quality mainly. Still able to play games. 4gb of vram will be fine since you are using a 1920x1200 monitor.
Checks all the basics, easy to work in, quiet, ok looking, price.
Reliable, efficient, quiet
IPS 27in
Mechanical, affordable
7000 DPI should help when doing video and photo editing.