Well, i normally buy 135/140mm units for silent purposes - this is my first 'duplo brick sized' PSU and putting my ear close to the case the fan is audible when not in passive mode. With the case under desk and soundproofed - it's silent. And obviously it's silent in passive mode until loaded. I, agree, with the warranty length to a degree - but when doubling the warranty length takes you to 10 years that's quite a jump - and would hopefully negate the any concerns if you were to reduce your swap outs (especially as you hold onto other components for lengthy periods, a quality PSU should match duration). From your criteria - i would opt for whatever the reviews allude to as the quietest all round performer.