Antec PSU's are cheaper because Enermax PSU's are specifically built to be low-noise. Most Enermax models even have a manually ajustable fan. (the speed of the fan can be altered with a little knob on the back op the PSU - of couse the slower the fan, the less noise it makes)
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Riocar 80gig S/N : 010101580 red
Riocar 80gig (010102106) - backup