Your best off doing what I did - buy one of those ATX powersupplies that have a 92mm fan undeneath, instead on a 80mm fan at the back. The trouble is, most of those types of Powersupply's draw air into the case, via the powersupply. So what you do is turn it arround so it exhausts warm air from the case & blows it into the powersupply, where it exist out the back. What you can then do is then replace the OEM 92mm powesupply fan with a quiet L1A1 92mm Panaflow (36cfm@12v), but rewire it to run at 7v, making it virtually silent (12v positive, 5 volt negative), then to make an allowance for the lower CFM, you put a quiet L1A1 80mm Panaflow fan at the back of the powersupply with exhausts the air out the back, & wire it to run at 7v.
What you could then do is buy one of those 120x60x60mm Alpha slot collers, from the Alpha website, but get one where the fins are orienteered the other way, to run the length of the heatsink, instead of across it (they do sell ones like that). BTW, you can also buy 'em with a shroud designed for those slot 1/A alphas with the fins running length wise. By doing this you could mount it in an ATX tower so the 92mm fan underneath the powersupply is only about a centimetre away from the top of the heatsink & it wouldn't be hard to mount a bit of ducting across. That way cool air will be drawn through the heatsink, then into the powersupply then out the back. I'd also mount a L1A1 12omm Panaflow fan at the fron of the case drawing fresh cold air in, & have it running at a silent 7v.
This way you have 3 quiet Panaflow fans running at 7v (a 120mm one at the front of the case sucking fresh air in, a 92mm fan underneath the power, mounted above the heatsink, that draws air through the heatsink & blows it into the powesupply, then a 80mm one at the back of the powersupply that exhausts the warm air out the back) which is definitly quieter than 2 or even 1 fan running at 12v.
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