going by what you said you're looking for this may be a fan you would want to look at,
http://www.directron.com/fanal12025b.html, 120MM X 25MM, Air Flow: 79.14 CFM @ 12V, Noise: <30 dBA, I use them in my watercooled dual athlon system and i'm gona be using them for the watercooling setup for my new system, they are nice and quiet with good airflow.