Okay i'm going to buy my friend a new PC for her 3d work, she's grown tired of her old Phenom X4 960T getting choked up by her tasks so i'm into the market to find something more powerful for her needs, so i thought this.
CPU: AMD FX 8320
RAM: 8GB DDR3 1066 (from her old system) maybe add another 8 to make it 16GB.
Graphics: Nvidia Geforce GTX 660 or Radeon HD 7870
Her demands are likely to be doing this at once.
Livestreaming: Mobile to normal to high quality.
Gaming (Doesn't play that intensive games, but still games that combined with streaming do knock her phenom out)
3D Modeling and Rendering in blender with other programs like Maya and all.
other day to day programs like your firefox's and itunes and all.
i can't go any higher into the i7 ranges and all and i heard the newer FX 8XXX's are really good CPU's for the tasks.