It also depends on the machine's history. WHen it was last used, when was it serviced last, how many owners has it had and how did they use it, do you have someone to service it ... not everyone will serivce the "old" Pfaffs.
Having said that I own three - one for parts, one in Alberta and one I just picked up from its original owner who hadn't used it in ten years and just sold one that I'd picked up from an estate sale from the original owner who could not have used it in nearly 25 years. Can you tell I just love this machine?
Like Mitch's Mom said, if you can get it for a good price with all the original books and accessories you won't be sorry.