While the Silverstone is of high quality and powerful ,it is a little on the loud side. (I currently own this) Heres a review:
http://jonnyguru.com/PSU/ST60F/ I would get the Seasonic if I would build my computer again just because of the noise. Its also high quality with a reputation for being quiet. The Corsair powersupplys are also built by Seasonic and are even quieter.
http://www.silentpcreview.com/article692-page1.html
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