I run the same with a speed controller very quietBuy a fan larger than you need and a speed controller to run it at reduced speed. I've got the following on a controller and it is whisper quiet up to about 40% which is the max airflow i ever need.
http://www.amazon.com/gp/product/B002JQ14F8/ref=wms_ohs_product?ie=UTF8&psc=1