I'm selling a Toshiba combo drive, model SD-R1202. The drive may not work in Jaguar, but it should be fully supported in Panther. It burns CD-Rs at 16x, burns CD-RWs at 10x, reads CDs at 40x, and reads DVDs at 12x. Not the fastest drive, but a very simple upgrade for any PowerMac running Panther.
EDIT: Sold.