I've seen a few threads around asking what is a good fan etc. Well what do you want? Silence? Do you need super air flow? This is the fan I bought and am using and am very happy with. This thing is DEAD SILENT and that's what I'm going for. If you're going for airflow, they have one(s) that may suit your needs. There are 3 different speed fans to choose from 800RPM, 1200RPM and 1600RPM model. Here's some specs:
800RPM
http://www.newegg.com/Product/Product.asp?Item=N82E16835185004
1200RPM
http://www.newegg.com/Product/Product.asp?Item=N82E16835185005
1600RPM
http://www.newegg.com/Product/Product.asp?Item=N82E16835185006
I will be using my 2 scythe 800RPM s-flex fans in my p180 along with my scythe ninja heatsink. one word though, they are pretty heavy. enjoy.
btw: i got mine for ~$10 shipped each when www.hardwarecooling.com had a 25% off sale on the 800RPM one. i also split shipping with 2 other friends, so prices may vary.
800RPM
http://www.newegg.com/Product/Product.asp?Item=N82E16835185004
1200RPM
http://www.newegg.com/Product/Product.asp?Item=N82E16835185005
1600RPM
http://www.newegg.com/Product/Product.asp?Item=N82E16835185006
I will be using my 2 scythe 800RPM s-flex fans in my p180 along with my scythe ninja heatsink. one word though, they are pretty heavy. enjoy.

btw: i got mine for ~$10 shipped each when www.hardwarecooling.com had a 25% off sale on the 800RPM one. i also split shipping with 2 other friends, so prices may vary.