Lara,
From the pictures of the 600, it looks like there are attachments, but no extra cams. If there are no cams you have a dickering point. My original 600 has about 6 cams in a paper box with the attachments. These cams are what will give you any additional stitches besides the basic zigzag and spinoffs from that (i.e.hem stitch)
Unlike many of the members on the board -- I love my 600s -- find them very dependable, tension stays put, have had no problems w/them. Got the first new, bought one used and was given a 600e. the 600e isn't the quality of the regular 600 especially the castings. But, most of the parts will be usable should anything fail on the others.
Kay