What wattage PSU should i get for my new build?

Winkyslide

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May 1, 2014
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Relevant specs are as follows:

-intel i5 2500k cpu
-evga gtx 780 gpu
-asus P8Z77-V Pro motherboard
-corsair vengeance ddr3 2x4 memory

I'm planning on overclocking like there is no tomorrow. Well i mean i havent built it yet so hopefully there is indeed a tomorrow but you get the point.

The thing is im pretty sure i could get away with a 650 ish watt PSU, but i know if i low ball it too hard i could really kill my system. On the other hand i dont want to go overboard and get a 1200w PSU because id rather spend the extra money on exotic coffee beans. So what would yall recommend for a build like mine?