The Ultimate Rez card works great under OS 9, but if you try to boot OS X with a monitor attached to it, the system will stop booting, so no support for OS X. It's a great card though, I think I'll use it for multiple monitor support in OS 9.

The next thing I'm gonna try out is the SCSI card, and I'll let you know if it works. :beige:

EDIT:SCSI card works, it's currently hooked to an 80mb SCSI Conner drive from my Color Classic.