gmat:
after reading the whole thread and thinking a bit......why dont you just add "beefier" heatsinks to a standard ATX PSU and then replace the fans with Vantec Stealths?
I mean, your 10K HDD is already your loudest component in your entire setup minus your PSU fans. It would just make sence to me to simply increase the surface area of the PSU heat producing sources and simply use a lower rated fan.
Am I completely off my rocker here or is there something I dont know?
Good luck