How big of a power supply do I need?

I'm thinking about building a new computer. My specs will be Core i5 3570K, ASRock
Z77 Extreme4, 4 to 8 gigs of RAM,gtx 560ti and a 500gb hard drive. I'm just wondering how big of a power supply i need. I may in the future run a sli setup with this, so a power supple capable to that and some overclocking as well. Any recomendations on my build will be greatly appreciated!
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  1. If you can hold off for a bit, then I would consider waiting until the new GTX 660s hit the street...that is going to spark a price war and drive the prices of the 560ti down.
  2. Rugger said:
    If you can hold off for a bit, then I would consider waiting until the new GTX 660s hit the street...that is going to spark a price war and drive the prices of the 560ti down.


    Yeah i was thinking about waiting and getting my graphics card. But i heard the new ones will be more power efficent.
  3. 500W is more than enough.

    For SLI 750W would more than suffice.
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