I am not "recommending" the adapter I am about to mention. Not only for running the Plextor anyway. This way you won't come back to bitch at me if the configuration doesn't work well for you or if you think the card is too expensive.

I have an Adaptec 19160. It's running my Cheetah Ultra160 LVD 18GB drive, the Narrow-SCSI Plextor and externally, my narrow ZIP and MicroTek scanner.

To get everything to work properly I had to update the firmware on the Plextor, the 19160, install ASPI 4.60 and also update to brand new Adaptec drivers. Prior to those upgrades I was only getting up to 8x audio extraction regardless of software settings.

Go look through the Adaptec site and also take a look at SCSI boards from Atto (I've used their stuff in Macs and I met a few people from the company while in San Fran at Macworld and they were great guys).

Bruno