I'm using a Fractal Design Tesla R2 650-Watt GOLD Certified Power supply.
This should be more than enough power to supply my system and any future components I may want to put in.
So far in my build:
-AMD A10-7850K APU
-AMD RG2133 16GB Gamer Series RAM
-Gigabyte GA-F2A88X-D3H Motherboard
-Sandisk 128GB SSD
-Western Digital 1TB 7200RPM HDD
-DVD-RW Drive
-Fractal Design Tesla R2 650-Watt 80 PLUS Gold Certified ATX12V/EPS12V 650 Power Supply FD-PSU-TS2B-650W