If you can whittle the price down enough, you might look at seeing if you can fit a Nvidia Geforce GTX 970 into the build. It's a pricey card at around $350, and it might be overkill on the stuff you want to play, but it's a beast of a card at its pricepoint. And I speak from experience that once you enter the glorious PC Master Race, your attitude quickly changes from "I just want to be able to run games at decent settings" to "WHY CAN'T I TURN THIS UP TO STUPID-MAX? MORE POWAH!"