Well, without more info to go on, here is a rough idea of how you could budget your build. I recommend going for Intel chipset/processor (significantly better performance in gaming benchmarks), and GPU is really up to you but I think Nvidia has a slight edge in performance/price.
Intel i7 (Sandy or Ivy bridge) - $300
Mobo (?) - $100
4x4GB Ram - $80
120gb SSD - $100
2TB Storage HDD - $100
GPU - $250
PSU - $50
Audio cards are kind of a thing of the past, I would skip it. Particularly if you have HDMI audio on your A/V receiver, then you will just be sending an HDMI signal from your GPU->Receiver and it will take care of both video and audio.
Shift money in the budget as you see fit. Could drop to i5 or drop the SSD to increase your GPU budget.
Didn't list specifics as it's usually better to shop sales and make smart buys rather then being fixated on certain brands. If you've built rigs in the past you should be adept at researching parts you find on sale to see whether it is hot or not.
PSN / Steam - KrimsonStudios