I am a soon to be happy owner of an Apple IIGS. It's just the base unit without drives or keyboard. The latter I got covered as I have a keyboard and mouse from my Mac Classic.
As for mass storage, I'm considering my options. If I am going to use the GS OS, is a proper hard drive a necessity? I've been looking at the SDisk II, which connects to the 20-pin connector of a floppy drive controller. Can the connecting cable simply be converted for the 19-pin floppy deive connector of the IIGS or do I need an adapter of sorts?