What Power Supply Do I need?

Hey guys I'm carrying out my first PC build so I'm new to this game. My build so far is:
CPU: i7-3770K
GPU: GTX 660
Motherboard: Gigabyte GA-Z77X-UD3H
Cooling: H80i
RAM: Corsair (2x4GB) DDR3 Vengeance Memory
SSD: Samsung 840 Series 120GB
HDD: Western Digital Caviar Black 500GB
Case: Fractal Design Define R4
Power Supply: ???????????????

I honestly have no idea what kind of wattage and power supply I need to power this system. I'm also considering overclocking parts of this build if that makes any difference?
Can somebody please point me in the right direction in what power supply I would need?

Thanks Guys

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    XFX Core Edition PRO650W (P1-650S-NLB9) 650W ATX12V 2.2 & ESP12V 2.91 SLI Ready CrossFire Ready 80 PLUS BRONZE Certified Active PFC Power Supply Top Value Award

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