When buying a used G1000, I would DEFINITELY make sure that the ZIP disk works as advertised. Without this functioning well, the whole thing is severely compromised. You used to be able to get replacement ZIPs, and self-install, but with SCSI getting long in the tooth, I don't know how easy they are to find, any more....

And the G1000 is a VERY good step up from the G800, well worth waiting for one rather that jump on the G800 (I had one prior to my G1000). A significantly better piano, saxes, drums..... If you can wait for a G1000, go for it!