These massive 200 mm fans can generate up to 103 CFM with only 20 dBA of noise thanks to their high performance design and low operational 500 to 900 RPM. The key here is you can easily replace several fans with just one of these. This will reduce noise and lower voltage use slightly, as well as potentially increase airflow too.
If you need something a bit flashier, NZXT will also be releasing the FZ-200 LED fan in 5 colors. These being white, blue, red, orange, and green to match with most cases on the market. The NZXT FZ-200 fans are available now for $17.99 and the FZ-200 LED fans are available for $20.99.