Best 120mm fans for push pull and silence

[Cenx]

Hi, Im wondering what are the best fans (2 in total) for a push pull configuration as well as silence, the QUIETER the BETTER! Price is not a problem, so suggest the best there is as well as a link where to buy. Thanks!!

 

[utgotye]

Noctua NF-F12, P12, S12 most likely.