as other said, new is better. BUT depends if it is worthy for you. There was a client in my job and wanted me to build his gaming rig from components he brought. It was nothing smaller than 5820, x99 killer board, *just only 16GB DDR 4 set, 240GB SSD and GTX 1080 (only thing I was bit jelaous I do not have it, and will not have it).
It was fancy stuff, but considering price of x58+5650+24GBs of Crucial with impressive timings, I am still like only on half price of 5820 CPU here, and that was for more ram, very good cpu and good board ( thought better cooling would be welcome). If I decide to buy R480 or 1060 I will be little bit more for 5820, but for whole base of system.
So the budget is the thing. Nothing will be bad. And if you are not computing for living (even if you are) old platform is pretty fine by its horsepower.