500W PSU should be more than enough .
XFX 550 W PSU will handle everything you throw at , including overclocks and future upgrades.
PCPartPicker part list:
http://pcpartpicker.com/p/xRwrxr
Price breakdown by merchant: http://pcpartpicker.com/p/xRwrxr/by_merchant/
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply ($59.98 @ OutletPC)
Total: $59.98
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-10-24 09:26 EDT-0400