If there is a budget to buy new components, consider to use a drive of a more recent make and adapt it to SCSI. Once you might benefit from the ease to go to the next computer store and simply buy a new drive in case of need.
How about an external SATA disk dock with an SCSI bridge adapter? The company Logilink provides cheap IDE/SATA converters (USD 20 for a bidirectional converter, cheaper and other makes might also be available). Add an IDE/SCSI bridge and you are ready to swap an external drive directly from your oldest to any recent Mac. External SATA to FireWire/USB docks are ready available. Extra useful when it comes to the task of making reliable backups.
If one finds a SATA harddisk drive would be a waste of speed and storage capacity, also consider to adapt a CF or SD card to replace the old drive. It's less waste and more silent.
How about an external SATA disk dock with an SCSI bridge adapter? The company Logilink provides cheap IDE/SATA converters (USD 20 for a bidirectional converter, cheaper and other makes might also be available). Add an IDE/SCSI bridge and you are ready to swap an external drive directly from your oldest to any recent Mac. External SATA to FireWire/USB docks are ready available. Extra useful when it comes to the task of making reliable backups.
If one finds a SATA harddisk drive would be a waste of speed and storage capacity, also consider to adapt a CF or SD card to replace the old drive. It's less waste and more silent.