Corsair Air Series SP120 PWM High Performance Edition (CO-9050013-WW)
A fan I use for my own current PC build, this pick finds a place on this list because it's constructed for optimum operation in air-restrictive areas of your case such as placed against water cooling radiators, in the front of your case, or placed near drive cages. It accomplishes this by being designed with high static pressure in mind in addition to high airflow. Static pressure expressed in millimeters/H2O and is a measure of how well a fan moves can move air through air restrictions.
This fan can deliver 3.1mm millimeters/H2O with is considered outstanding. It produces 62.74 CFM at 2350 rpm with a sound output of just 35 decibels without being overly loud. If your case fans are going to be used in conjunction with water cooling radiators or you need fans for the front of your case in air-restricted areas, this fan is the ideal solution.