My current server is an Antec three hundred case and uses three antec true quiet fans to cool. My air intake is filtered through a modified furnace filter resulting in a completely dust free case. The temperature within the case is kept very cool and averages around 42C. The case is fairly quiet and the aging power supply and cpu fan contribute to most of the noise.
The server is primarily used for torrents and xbmc with little gaming.
The problem is that the case is starting to get a little cramped. I have six hard drives in the case and am looking to add another two in the near future.
I am therefore looking to replace the case and expand my system. I will replace the old AMD processor with a new intel i5 as well as upgrade the power supply. The graphics card is an asus gt640 silent.
What I would like advice on is the selection of an appropriate case for this build. My budget is under $400 and I have no problems paying for high end cases like the Cosmos II if it is the most appropriate.
My criteria are:
1.) Large - I like lots of room to play with
2.) Quiet - I want something that is fairly quiet, ideally no more noisy than my current system.
3.) Good airflow and the ability to add air filtration as needed