You should be able to stuff the Nubus ones into a 950 with a PPC 100 upgrade card (thats where I stuck my ABVB AVID into). You need the PPC, SCSI, ABVB, DSP, Audio card so thats all 5 slots. Avid 6.5 is PPC only. I should have some PDF docs if you need help.

PM me if you are ditching the PCI cards.