Do you need the DVD reading function or just the CD burning? If you only need a burner the Lite-on 52327S is fully supported by anything above 10.2.8 including Panther. You'll need to take the tray front off it though as otherwise it won't clear the cutouts on the MDD drive bays. These drives are really cheap. Amazon in the UK have them for £25. Apparently they have been seen for $19 after rebate in the US.
I have one - works great.
If you need a DVD/CDRW then there is a fully supported LG drive but I can't recall it's model number. Check xlr8yourmac.com