fans: either panaflo (panasonic) or Sunon - while the panaflos are *slightly* better they are kinda pricey.
Eg. the 80mm panaflo moves 39.6cfm air at 32db noise and is $12, the sunon 80mm moves 39cfm air at the same noise level and is only $5. (newegg(
I have the sunons and i am quite satisfied with 'em.
If you get a GOOD, big heatsink like the alpha8045 then you can use one of these quiet and slow fans and still get very good cooling.
(for me that is like 40 deg. idle and 48 load for an overclocked 1800 at 2000 speed.)
The fan's noise is totally neglectible.