I'm doing the exact same thing for my grandpa. I was leaning towards your build but I'm worried about the longevity of a dual core cpu. Although it's a fantastic cpu, don't get me wrong. So I'm currently contemplating maybe:
AMD A8-7600 3.1 GHz Quad Core Socket FM2+ 65W MSI Socket FM2+ A68HM-P33 V2 or the FX 4300 with a mobo with integrated graphics. The 860k that was suggested is kind of out of the question because I can't find a mobo with iGPU and the dedicated GPU raises the cost too much. Even the cheapest one.
What do you think? Am I being paranoid for wanting a quadcore?