You can start here:
on a side note, I would find one that is quite. my new "power" PC has a fan.. but it is louder than I want
I have an Antec for the case, a Taisol for the CPU.... and another one.. not sure of the name, BUT my pc fans, etc are loud.
Not sure which was is the loudest or causing the most noise...BUT if I had to redo it... BUY quiet ones and spend more money if neccessary.
NOTE: even one of the fans says its a "quiet fan"..... yeah, right.