[Help] Switching from Console

Hello,

I'm switching from console to PC, and I don't know very much on building one. I was planning to follow the $600 guide, but I really want to drop the cost down to $500.

2 Goals:

  1. Total Cost: $500- $50
  2. Game Quality: High 

I just would like a decent system that can be updated in the future. 

Thanks for the Help!

http://pcpartpicker.com/p/1Q5mW

could get a 7870 for a bit more this one is $500 before rebates