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PC Power & Cooking 510 SLI will beat all the above ^^ if you thing your psu was holding you back get a PC P&C.
But 480w is more than enough to power any system, it was not the wattage that failed you it was the quality of product. So might as well get the best and not have any more doubts.
Seasonic is great too tho, just aslong as your mobo is compatable.
Dont forget even tho the 510 has a higher top end then most 600w PSU's if numbers are your thing they make a 800w and 1000w PSU also.