It depends on the chosen components. If you'd get a 8800GT graphics card, it would need some airflow over the Accelero S1 cooler, any 500+rpm fan will do, and there should be just enough breathing space to slap one on. You can pretty much rule out any PCI / PCIe addon cards though then, but most things are on board anyway eh?
For a 7600GT type card, they are less hot, so you would never have to bother.
The Scythe Ninja is one hell of a cpu cooler that you can't beat at its price. The new Western Digital Greenpower series harddisks are the quiettest (at no real big cost of speed) drives available up to 1000GB.
If you then buy three of these:
http://www.pccasegear.com/prod3489.htm
or these:
http://www.pccasegear.com/prod6023.htm
with one going in the back of the case as exhaust, one going on the Ninja cpu cooler, and one stuck to the graphics card Accelero S1 cooler.. Thats all you need, it will cool anything dualcore and up to a 8800GT with ease. No front intake fans will be required.
The powersupply that comes with the 3480 case is high quality, and fairly quiet.. If after this build you'd still want less noise, you can consider upgrading it to a Seasonic S12 model (430Watts is plenty)..
I think you'd be verry happy with the performance and silence of such a system..
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