I would recommend this, click
Here
This is a pretty powerful CPU, and it has a decent GPU on board.
The GPU that comes integrated is very good for the price, and you can pick up another GPU if the integrated one is not good enough for you, for a decent price as well.
I play on an old GTX 570, the game performs well, with my Phenom II X6 1100T, It plays at over 100 FPS at over 1000 Time compression fine, with no CTD's or lag. The Phenom II X6 1100T is not in production anymore so they may be hard to find, they also should be cheap now.
NewEgg.com sold out within weeks of it being taken out of production, so, not on my own opinion here, they must be good.
I would go with the A10 6800K (Richland Architecture) if I were building a Gaming PC on a budget.
Just read the reviews!
Or you could wait for the Next Generation of Steamroller APU's (Kaveri)