Quietest PSU??

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I am going to attempt to silence my computer and was wondering what power supplies are very silent? Beyond that I am going to purchase quieter fans and improve the airflow inside my pc by bundling up and wrapping the wires. Any other suggestions that could help improve the airflow and noise comming from my box?

[JPMiller]

Well one thing that can quiet down case fans and power supply's is removing the metal grills that are in front of them, ...sometimes that is what is causing the most noise and air turbulence.
I always use tin-snips and/or a dremel to remove as much of the "hole punched" guards as I can and then any that show or I'm afraid need guards I replace with the wire style fan guards like this.
http://www.svcompucycle.com/svcompucycle/58556.html

[tony_j15]

Zalman makes some "silent" psu's. Also, check out the Nexus NX-4000.

[links]

Is it really that noticable of a difference for either the Zalmans or the Nexus? $100 seems pretty steep just to reduce a little noise. Any body have one of these that can comment?