I bought this case as a quiet case, and it lives up to its name.  Now I want to make it quieter.  As i understand it the case fan included with the case is not necessarily that quiet (btw, i have the fan connected to the fan-only connector).  With my zalman cnps7000a-cu in there on silent mode, i can only hear the case and psu fans.
 
Basically, what i want to know is, will upgrading to another case fan (eg nexus real quiet 120mm)be worthwhile? Or will it be an upgrade at all?
 
What is the quietest 120mmm case fan you can get?
 
thanks all.

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They claim 14dBa though I've never used them myself so don't take my word for it...

I would also suggest getting a real fan controller, rather than using the fan connectors on your power supply(not that these are bad for most uses).  Just if you want the ultimate in quiet, a fan controller lets you decide yourself the optimum balance between noise and temperature that fits your standards.  I know that it was one of best investments I ever made(and just bought items 5 and 6 or something in my quest for quiet   )