Best 120/140mm Case Fans?

Hardware Build a PC
1

Planning on getting new PC soon, and wondering which case fans I should get. 

Here's the current build: http://pcpartpicker.com/p/1GRZC

It has a max budget of $550...

I'd like it to be whisper quiet, anything under 40Db.

2

There's a lot of space between whisper quiet and 40dB. Look into Cougar Vortexes; fantastic fans for SP, CFM, and price to performance, both in 120mm and 140mm variants.

3

Bitfenix's Spectre Pro PWM's are extremely good. On paper at least.

4

ಠ_ಠ

Some of the worst fans ever made; on paper, sure, they look great, but they are rubbish in reality, and far from "rated" specs.

 

5

Thanks for replying so early. I already had this bias in my mind that Cougar products are terrible, the cases at least.

Does this look good to you?

http://pcpartpicker.com/p/1GS96

6

If you don't want to OC your CPU, it's great.