Apparently selling separate will get you more money. But if you want the most I would make sure the A4000 is clean and in working shape with pics, etc. Also include a mouse and keyboard and system disks, manuals. You will get more for it if potential buyers see it's a nice clean complete system. Also remove the battery if it's a NiCad.
Example prices:
A4000 setup complete and working $200-$500
Picasso IV card $400-$500
Apollo 4060 card $400-$600.
Those are eRape prices though! Keep that in mind.