I will probably get some flaming for this but I have quickly thrown together something with a FX-8350 which from what I have read gets very close or matches the I7 in a number of highly threaded applications such as rendering and is much cheaper. I have stuck with the quadro 4000 djinline suggested as I don't know much about workstation graphics but I wouldn't be suprised if a 6gb 7970 ghz matched it or was better.
http://pcpartpicker.com/p/qpTh