for the fan noise - try running the stock fan at 5V using one of these (or wire it yourself)
[img]http://www.moddiy.com/product_images/j/547/T1JRxJXglbXXce7cAT_011207__14471_zoom.jpg
5V is sufficient for running at 381.25MHz/1255GH/63C/58C when drawing in air thats about 5C. In the same conditions 7V is about 30% louder and brings the temps to 57C/53C.
for room temperaure intake, 5V probably isnt suitable for running above 350MHz
How much noise is reduced with 5V ? can this controller works?
http://www.dx.com/p/12w-speed-controller-for-heatsink-cooling-fan-dc-5-12v-171354#.VKbWK9KG95Mproblem with your link is its a 1A controller, whereas the fan is likely 1.3A rated. So if you used that controller at 5V it would run slower than allowing the fan a full 1.3A at 5V
5V is about 1/3 as loud as 12V. The noise is similar to a microwave or a window-mount A/C - not silent but at least reasonable for a spare room or a corner of the living room.