We have a Southfork in the shop here that was returned by a customer after using it just twice. (His friends all have Outcasts and he had Outcast envy).
The boat is in great shape and comes with the padded seat upgrade. We are selling it for $450.
I was in Boise over July 4th and saw the imitation Southfork @ Sportsman's Warehouse. Not that its crappy at all, and is still made by Bucks, but heavier, of lesser quality construction, and cheaper materials. I'd say to make sure you are comparing apples to apples, but there are a lot of different kinds of apples - especially when pontoon boat shopping these days.