Hi I am looking for a 80 plus certified My RIG is as followed:
i5 2500K stock and will be overclocking upto 4.5 - 4.8 Corsair 2x4 1333 value select Sapphire 6950 1GB Asus P8P67 PRO B3 PSU Iball sprinter 600 watts which is a crap need a new one 20" samsung monitor Corsair H50 CPU Cooler
i just had a look for seasonic S12D 850 80 plus silver which is non modular that really doesn't matters not looking for very expensive PSU for about 130 - 150 $ only.
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That rig will run on a 500 watt PSU .
To give yourself some head room get the TX 650
Seasonic is a safe bet, also check out the Corsair TX750.