I'm building a new system in a full tower case, and I have two options for mounting my hard drives. One is placing them at the top half of the back of the case, above the power supply. I'd be a little concered about heat from the psu, but there are perforated spots directly beind the drives where I could mount one or two 80 mm fans. The second option is mounting them at the bottom front of the case, below the optical drives. They'd be away from major sources of heat, but not in the path of airflow through the case. I have two extra 80 mm cooling fans to use if I need them, but I'm wondering where would be best to mount them. As I mentioned one option is monting one or both above the power supply. I was also considering installing one in the side of my case to cool the cpu (Athalon 1600, may OC it later) and video card (radeon 9600 w/out a fan). Would this be a good idea? If so, should it blow air inside the case, or vent air out? I'm actually not sure if I'll need any additional fans at all (besides the front intake fan + 2 in the psu itself), but I figure at least one woudn't be a bad idea... opinons?