Internal scsi drives on mac pro?

I have just received my Mac Pro, which will soon be put into use as the center of a commercial audio recording facility. I was under the impression that the SCSI drives I had been using in my aging MDD dual 1 GHZ would be port-able to the new box. But, after snooping around a little bit on the boards here, and looking into the machine itself, this appears not to be possible.
Is it true that ONLY SATA drives are compatible as internal drives in the new Macs?
If so, then I need to sort out my new drive configuration for the studio machine. For better or worse, my studio uses ProTools, which does not support RAID of any sort. So I'm left looking at sharing the internal SATA bus with the system drive, going with an external FW800 drive, or investing in an external SCSI drive (ugh).
Any thoughts would be welcome.
Thanks,
Nick
mp 8-core 3ghz   Mac OS X (10.4.9)   8gb RAM

following up on this thread -
I purchased the external chassis recommended above and have compared transfer rates with the somewhat unscientific copy time test, from the desktop of the apple SATA boot drive to and between various other drives. It appears that the internal SATA 7200RPM drive I bought from OWC is outperforming the external (10000RPM) SCSI drives I have mounted in the enclosure. This seems odd to me. I'm not sure if the bus speed is being ratcheted down to accommodate the cabling (SCSI 3) or what. I appear to be getting roughly one third of the 160MB/S limit on the Ultra160 drive (the buffer size is 8MB on this drive as opposed to 16MB on the 7200 drive).
Theoretically, the bus throughput is higher on the SATA bus, but I thought that would be outweighed by the drive performance - that appears not to be true. It also appears that the SATA drive is FASTER on the duplication process than the SCSI drive, which leads me to believe that the rotation speed is being trumped by something else - buffer size perhaps?
Any thoughts would be welcome. Here are the results of my testing.
Copying 1.27GB .zip archive:
desktop to 2nd internal SATA drive: 19 seconds (68MB/S or .53Gb/S)
desktop to external SCSI drive: 25 seconds (52MB/S)
2nd internal SATA to desktop: 19 seconds (68MB/S)
Duplicating 1.27GB .zip archive on the same drive:
internal SATA: 50 seconds
external SCSI drive #2: 58 seconds

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