Now you've opened up another can of worms!
There are so many option's on what the best saw is, and they all are wrong.
I've never seen or even heard of a Shop Smith scroll saw so I have no opinion on that. It must be fairly old because I'm not even sure that they still make many tools anymore. And a Crapsman is considered a fairly good entry level saw but, there are others in the same "new" price range.
The best saw you can buy is the one YOU like in your price range.
New scroll saws vary in price from just under $200.00 to $2,000.00 as you know, and they all have good and bad features and they all have problems from time to time.
Just remember, you usually get what you pay for and buying someone else's problems is NEVER cheap. If you know the previous owner and trust what he tells you, it might be a good buy but, if it is advertised on line it is a case of "Byer Beware".
Rog