You dont need the 650 watt psu . The Asrock board cant crossfire or sli so all you need for the 7850 is 500 watts
That could save you enough to get a better board like the ASUS M5A97 R2.0 and a case with front USB3 ports like the Antec One gamer , Or cm 431
Is this better:
OCZ CoreXStream 500WATT
Asus M5A97 R2.0,sAM3+
Cooler Master Elite 431 PLUS with Window?