The ten most compatable are the last ten models by Plextor, they seem to do the best on the subchannel where the graphics are hiding.
You can get one from MTU that has been tested, and certified to CD+G backups or get one from your local computer store that has not been tested, and may or may not get you good backups...
Jim
FYI here is a link to the list of supported burners that are supported by Microstudio, go to the very bottom of the linked page:
http://www.mtu.com/basics/karaokecdr.htm