Hi mate, check
THIS IMAGE
It shows where the fan lives!! I'm not actually using the 120mm fan which is supplied with the cooler. I'm using a 1200rpm Scythe S-flex fan. Keeps my clocked Q6600 cool without making any racket!! I'm using a similar fan as an intake fan to suck clean air into the case to cool the 8800GTX.
PSU - now, here I actually bought a new one specifically because I wanted to be able to remove and clean the airfilter located in the bottom (PSU) compartment. I use the Enermax 650W Modu82 + because it is short enough to enable access to that pesky air filter AND it's the quitest PSU I've used.
Hope that helps bud