Hi all. I am new to the site and wanted advice on upgrading my custom build or building a headless node. Would like to keep it under $1,000

Current build is as follows.
CPU i7-3930K .3.2GHz
32 GB Corsair Vengeance memory (DDR# 1600 MHz
ASUS Sabertooth X79 LGA 2011 6Gb/s
850 Watts

I model and render with 3DS Max (VRay), Blender (Cycles), and Rhino (VRay)
any help would be appreciated!