What are my options for connecting a bunch of legacy SCSI devices to a current Mac? I have a bunch of older 25-pin SCSI devices (film scanners, inlcuding a Polaroid Sprintscan 4x5, Polaroid Sprintscan 35mm and an Imacon). These are currently attached to an old G3 PowerMac which has an old Adaptec 1394 SCSI card in it. However, it's dog slow and I need to retire it.

I currently have a 2007 Core Duo iMac and a new 8-Core Mac Pro on order and I would like to find a way to connect these devices up. Either through a PCI SCSI card on the Pro or (preferably) a firewire/usb adapter on the iMac.

What are my options here?