I own several makes of guns, including winchesters. While I do not own a Sauer, I have handled and used them on a few occassions and I have to agree that they are a much better made gun than the winchesters.
Sauers are a lot more expensive than winchesters, so, even though the sauer is used with 99.9% mint condition, I'm surprised that the difference is only $200. Even at that price difference, I would get the Sauer. To make the deal even sweeter, just try to get the Sauer for a little less money.
Zachary