hi there...
I'm also starting a build for modeling and rendering workstation, and researched the issue for the past few weeks.
for me the 1800x/1700x, is the best choice. and for gaming too (moor game are coming out with multi-threaded support like bf1, so for the long run its the smartest choice).
for now, this is my build (feel free to comment):
1800X cpu
ASUS CROSSHAIR-VI-HERO mo
1080ti (i'm waiting for asus after market model)
Corsair Vengeance LPX 16GB DDR4 3000MHz CL15
SSD Samsung 850 EVO 500GB
and the Fractal Design Define S case or the NZXT Noctis 450 Black
I'm not sure about what kind of cooling to get, didn't to the research yet. maybe the H115i (probably an overkill). i don't know how important the cpu cooling quality is for rendering and modeling, mybe a 40$ cooler will do the same job.
good luck! (-:
