Be carefull on reducing cfm, under heavy use they do heat up. I had one user found a fan with a temp control module. The only problem it was a high speed fan 4200rpm and it was extremely noise. The user pulled it for noise after 3 days. It would be nice to have a speed control, may look into that. I have a 92 & 120mm fans with speed controls.
The fan I installed was louder than the original. I keep for getting to order the original fan. It was quite. I'm a little gun shy after frying my last unit. So I plan on replacing the fans every 2-3 yrs.
As for a Great Utility CD try this
Ultimate Boot CD It's loaded with all kind of disk utilities.