Maybe I'll get flamed to hell for this, but it seems to me that a lot of old Mac PPC hardware is floating around. I just pulled a Performa 5200CDS out of my garage. It has a built in CD, Floppy, monitor, 32MB of ram, a PPC 603 cpu and a ethernet interface. I HATE Mac OS 8 or 9. It would be FANTASTIC to load Amiga OS on this. Why has no one made a port? It would open up the available hardware for Amiga OS and breathe new life into old hardware. I'd much rather load Amiga OS on it.
Just a rant and a thought!
As others already stated such 60x stuff is too outdated given the fact that G4 hardware is realy very cheap (the mini costs a bit still, but the others are really, really cheap). And while MorphOS on a low end ppc is fun already, the joy is even greater with some serious horse power(there are *demading* tasks available for MorphOS). Mac mini, Powermac G4 and eMac are pretty good choices. The powerbook port will be the icing on top.