<snip>
I need to get SCSI!
</snip>

No, actually you can get away with a Promise (or similar) PCI-based IDE controller. I got one for about $30 at a computer trade show; it may be possible to find it for even less used. You would then disable the secondary IDE and let the PCI card take over, at least as secondary. From experience, I know the Promise cards work with Knoppix.