okay well here i go.
I suggest a AMD card because they are going much farther in areas that other graphics cards for examples they are developing a new brand of cards that need no drivers. I would recommend for next gen gaming a 7870 OC edition its the best bang for your buck
Then onto the CPU. The AMD FX 8350 would be a ideal partner for the card because the next gen games for pc are using more than 6 cores which the 8350 is 8 cores at 4 ghz.
go for the 7870 GHz edition and FX 8350 (with the hyper 212 because they can run hot)