PSU Help

Can anyone tell me how many watts this build need? And yes I've tried wattage calculators, they all give me totally different answers. Also, I don't know which PSU to get. So far I've heard great stuff about Seasonic. Can someone confirm that they're good?

MOB - P8Z77-V

Processor - i5 3750k

RAM - CORSAIR Vengeance 8GB 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800)

HDD - Western Digital Caviar Black 500 GB SATA III 7200 RPM 32 MB Cache

Case - Antec Six Hundred V2 Computer Case

Optical Drive - Asus 24xDVD-RW Serial ATA Internal OEM Drive DRW-24B1ST

Monitor - Asus VE228H 21.5-Inch Full-HD LED Monitor with Integrated Speakers

Graphics Card - Nvidia Gtx 670

PSU - You guys tell me?
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More about help
  1. 500W if you don't plan on SLI

    650W if you plan on dual SLI

    850W if you plan on quad/tri SLI

    Seasonic is a great brand/OEM maker of power supplies, they make many of Corsair, Antec, and the entire line of XFX Power supplies.
  2. The Seasonic M12II-520 is sufficient for your build and slight-moderate OCs. Great deal on it right now at Newegg:
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