From what I understood, the main difference and why the sf450 is more quite is because it has a better fan-control. The silverstones seem to spin-up the fan more keeping the unit at lower temps and thus being slightly more noisy.i will go with the sf 450 too, it just has the better power circuit then the silverstone
Look at these graphs from toms hardware:
Notice how the 450 hardly ever leaves the 25dBA area.
Links:
Corsair SF450 PSU Review
Corsair SF600 PSU Efficiency, Temperature And Noise
SilverStone SX500-LG Power Supply Review
SilverStone SX550 PSU Efficiency, Temperature & Noise
SilverStone SX600-G SFX Power Supply Review
http://www.tomshardware.com/reviews/lian-li-pe-750-sfx-l-750w-power-supply,4727.html
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