Good info from Ami_GFX. I would add to be mindfull of what version of the OS and other expansions you will want to use. SCSI controllers are probably the best but they all have an onboard rom (in addition to the one on the motherboard). These roms had to be upgraded for best efficiency or to work at all with newer stuff. Some used controllers have already been upgraded. I wish I could be more specific, but others here have more experience with this.
There are still SCSI CD Rom drives, writers, scanners available on e-Bay.
