Welcome to the Anandtech forums!
If you do a search of the forums, you will find a ton of info on Panaflo L1A 80mm fans. They're easily available, cheap (
www.bgmicro.com), and very quiet. Another name that pops up a lot is Papst...those are harder to find and I really don't know much about them.
But I just snagged 10 of those Panaflos and put one as a replacement power supply fan, 1 as a CPU fan on my Alpha 8045 heatsink, and one as a case fan (er once the case arrives ).
Gaidin