I personally like my Corsair SP120 Quiet Edition PWM fans. They provide great static pressure and acoustic performance and will not break the bank like many Noctua fans. A fans level of noise can also depend on how many RPMs you have it set to run. If you connect them to a fan controller or if you have PWM fans connected to a PWM header on the motherboard, you can turn down the RPMs to what you are comfortable with and reduce noise even further.