If you want quiet, dont use ANY fan.
The noise of moving air will be enough to annoy you.
If what you want is REAL silence just eliminate fans from the equation. No matter how "silent", "slow", etc..
Now you must solve the thermal equation of cooling your water with no fan. For this you must use a rad designed specially for passive cooling. Those are not the same as rads designed to get forced airflow through them. Fins will be larger, and will have more space between them.
Ideally you must layout your passive rads so their fins are vertical.
I'm currently buiding such a config, and i'm not the first to do it (do a search on OC forums and on audio enthusiasts sites). Using 2 or 3 rads in parallel is an option.
You'll want to add sinks to every hot component (dont forget main RAM, graphic ram, northbridge - watercooled if VIA -, etc)
about the PSU: TK power makes fanless PSU's. A german company does as well. If they're too expensive for U just watercool your current PSU.
Beware of HD noise as well. Try to use suspension mounts and if it's a hot bitch watercool it as well.
Remember your original design goal: silence. Adding a fan just breaks this goal. Fans *are* noisy, even 7v panaflos.
Now if your design goal is extreme OC through extreme low temps forget what i said. Buy 6 or 7 panaflos and a phase change system.
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