PSU Help

[DinoMan]

Here's the build I'm planning: http://pcpartpicker.com/p/d3sd

I'm having a hard time choosing a PSU. I calculated my wattage: 509. I'm also going to overclock. I'm guessing I need around 600 watts. It would also be good if my PSU was modular. Any help?

 

[inzone]

SeaSonic M12II 650 SS-650AM 650W ATX12V / EPS12V SLI Ready 80 PLUS BRONZE Certified Modular Active PFC Semi-modular Power Supply
$109.99
http://www.newegg.com/Product/Product.aspx?Item=N82E16817151106

CORSAIR Professional Series HX650 (CMPSU-650HX) 650W ATX12V v2.2 / EPS12V 2.91 SLI Ready 80 PLUS BRONZE Certified Modular Active PFC Power Supply
$109.99 and a $20 rebate making the final price $89.99.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139012

Antec HCG M Series HCG-620M 620W ATX12V / EPS12V SLI Ready CrossFire Ready 80 PLUS BRONZE Certified Modular Active PFC Power Supply
$84.99 and a $20 rebate makes the final price $64.99.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817371059

Here are a couple for you to look at and not knowing your budget amount available for the psu purchase I went with the top brand SeaSonic first and then the next one Antec and then Corsair. The modular psu's are a little more price wise and all of these should be good for what you want to do. If you plan on another video card later on for Crossfire then you want a 650w or higher.