Fulax spec is spot on IMO!
(I think he meant 4670k in his post rather than 4770k. He did spec the 4670k which is spot on for single card high end gaming)
I myself game on a 290x, which is basically a 290 but with 5% more performance and will tell you that if i were to buy again for pure gaming, the 290 would be my first choice. They are great cards, insane value for money considering they target the upper performance bracket.