Power level needed for this PC?

[RighteousGamer]

I am curious what is a sufficient power supply needed for single monitor 1080p 23', GTX 780, 8-16 (Not sure yet) Gigs of Ram, 1 Terabyte of harddrive, intel i7 4770k. Would I need 650 750 or 850w. Just want to make sure I don't go overboard and spend more then I need to. I just want what will get the job done. (This will mostly be used for gaming) (It is also a http://www.newegg.com/Product/Product.aspx?Item=N82E16817139021 .)

 

[C12Friedman]

A quality 550W, the XFX Core Edition PRO550W would do fine unless you are considering the option of SLI in the future - if considering SLI, I'll suggest an 800-850W, the XFX Core Edition 850W would work there
Both will give headroom for overclocking and such

 

[RighteousGamer]

Thanks