You are already looking at the best PSU of around 600w, the Corsair 620w is based around the Seasonic S12 but with the M12s modular connectors and supposedly built to even higher (than the already high) standards than standard Seasonic products plus you get 5 years warranty which is as long a warranty as is on the market. Corsair also tested the HX620 with a quad-core system and dual 8800GTXs if that helps.
OCZ GameXStream 700w i got this because they love them in the states and down under, and ive seen a magazine group test (cant remember which one) where they used this to power various 8800 gtx sli setups with no problems. this is the same as the fsp sparkle and at under a ton its a beast for the money
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