@Jethro_Tull:
You could buy one on ebay for a little amount of money. Don't worry too much if SCSI-disk is a few years old, they are built to last much longer than regular drives they have plus they have usually been run in a server at continiously low temperatures.
For a cheap and ok drive, I would recommend an IBM Ultrastar 36LP at 10GB. It is more than fast enough for the BlizzPPC SCSI-interface (30MB/Sec with my CSPPC and 6.8ms avg seek) and doesn't sound very much. You can find such drives on ebay for around 20EUR. Though this is just an example, there are plenty of other good drives. Also make sure you get adequate SCSI cabling and termination.
If you can have SCSI instead, I wouldn't bother with the FastATA option as is doesn't use DMA transfers to/from memory.
There is also the solution with an IDE<->SCSI bridge produced by Acard which will allow you to use a regular IDE-drive on the SCSI-chain.
/Patrik
