Digital BW, The Print

At work we use many firewire drive enclosures based on the newest 
Oxford 911 chip. These are far more reliable than the Avid Quiet Drive 
enclosures that use the Intio chip, and they are 6 to 8 times less 
expensive. We use Maxtor Diamond Max 10 drives. The newest Oxford chip 
allows a RAID 0 configuration through the chip, so you can get closer 
to the 400mb/s speed of the firewire as well as much larger volumes.

Alternately you could install a PCI card that has external SATA 
connections and use an external SATA enclosure.