Try the aluminum external drives for Other World Computing (http://eshop.macsales.com). You can spec out the internal unit (I recommend a Seagate for low noise) if you give them a call. The techs there are very knowledgeable and may be able to help you pick the best configuration. The cases have no fans, so should be quiet with the right drive mechanism. Other World Computing also sells the NewerTech MiniStack line and these may also work well.
