[CentOS] [OT] External RAID storage / NAS

> Do you have a quiet, external drive case in mind?

I would suggest eSATA cases. An si3124 controller with 4 eSATA ports is 
available for around 100USD.

I don't know when port multiplier support will be available but when it 
is, you can attached a 5 bay SATA (non-raid) disk enclosure to a single 
eSATA port. That should give plenty of room for growth with software 
raid (if you want software raid). In the mean time, you could look at 
getting 750GB drives on single drive eSATA cases. eSATA is much better 
than USB 2.0 for disks. Or go firewire. USB2.0 is a joke for high bandwidth.