I would also add that you CANNOT use fan monitoring with the 7 volt hookup, as it raises the fan's 0v level to 5 volts.
Some motherboards allow fan control through the onboard positions - software such as
http://www.almico.com/speedfan.php
Lets you vary the speed of certain fans in response to certain temperatures.
Implementation of this feature is patchy though!
"Noisekiller" power supplies often have a thermal fan solution internally.
If combined with one of the heatsinks with a thermal fan, and low speed case fans, you can make a relatively quiet system.
The low cost Q-Tec PSU range includes "low noise" models, but a well reviewed brand would probably be a better choice.