The trick to PSU's is getting one that is beefier than the total calculated wattage needed. About a year ago my 430 watt psu died so I went and got this one:
http://www.antec.com/us/productDetails.php?ProdID=26500
Its whisper quiet, it has dual fan thru design, secondary fan only kicks in when needed, but the best part is there's no main braid of wires coming out of the unit. It comes with rounded cables that connect on both ends, one side to the psu, one side to the device. You only need to connect the ones you need, eliminating extra unused dangling cables which restrict air flow, and can be dangerous. It comes with all the standard molex types, extensions, and even has the nice fancy SATA power connections which was perfect for me since I have twin WD SATA drives in the system.
Like I said this was about a year ago, it seems they have added new versions on their site, but that link above is to my particular unit. Go to thier product section to see their more current units.
good luck
edit: btw, this brand/model was available retail at compusa but I am sure you can web order, or walk-in to a shop. I was lucky that saturday morning that I was able to buy this that day, not ruining a gaming weekend by having to web order and wait
"In the event that I am reincarnated, I would like to return as a deadly virus, in order to contribute something to solve overpopulation" Prince Philip 1988