I'd say forget CDROM and go for PCMCIA Ethernet card. You probably have some PC to use as server, and there are better ways to listen to audioCD..
Just keep in mind getting PCMCIA friendly turbo card.
..and try to fix A600 like a real Amiga fan ;-)
amigakit is ok if you got deep pockets.. otherwise try to find some friend, lot of people threw away valuable Amiga hardware :cry: