"roaring cpu fan"

A little surgery can replace noisy fans with modern VERY quiet ones - if you get several, and undervolt them (by running them from the difference between the 12v & 5v lines, you get about 7v) they run slower & quieter and will push enough air if you have enough of them. You can get VERY large diameter ones nowadays too... If you have a hassle with the power supply fan - you can get very quiet PSUs, even ones that are designed to run with no fans at all...