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.
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