I wanted to install an internal DVD burner in my 8500/SonnetG3 but realized it was a huge hassle ( for me ) to scsi/ide/converter or what ever had to be done and much beyond my technical skills which is really limited to replacing batteries and plugging in PCI cards.
I ended up purchasing an LG external burner and connect it via FireWire to my 8500/SonnetG3. ( The 8500/SonnetG3 has FireWire PCI and USB PCI cards ) This LG burner can also do DVD RAM. I installed the same kind in my QS G4. A more simple/fast solution for me. Although I did replace the internal CD drive with a CD burner/drive.
You may find this site interestinghelpful or not: http://www.galttech.com/research/computer-reviews/best-dvd-burners.php