For 3D rendering? That 6700K is going to choke, and the OP stated he needs around 128GB of RAM.
OP, we really need to know what program you're going to be mainly using.
As a starting point, however, you're most likely looking at a dual Xeon setup (dual Intel Xeon E5 2670). Or maybe just a single Xeon setup. Either way, the Xeon E5 2670 is amazing value:
http://www.ebay.com/itm/Intel-XEON-...rk=1&rkt=6&sd=191868730909&afsrc=1&rmvSB=true
Then you'll need to get a supporting motherboard and RAM. Some people here recommend purchasing a second hand server system (PSU, motherboard already installed) and simply dropping in the CPUs and RAM required to avoid any aggravation.
But we really need to know which app you'll be using to recommend either an Nvidia or AMD card.