I owned a 2000 Four Winns 268 Vista for 6 years. It was the best in class for available room, layout, value for your dollar in a 25-28 ft. single engine cruiser. I also know 8 people that do own, or have owned the same boat in varying years. I have never heard of any problems with structural issues on these boats. It is
possible for any boat that old, but it is not an inherent problem with Four Winns or the 268 Vista. The boat performs just fine with a 5.7L duo prop drive, unless you try to have 8 people on board for a cruise. Then it will struggle a bit to get on plane. We used our's on some inland lakes, but mostly on Lake Michigan, and it was well suited to those waters. Deck hardware is all through bolted, stringers and bulkheads are encapsulated wood. If the boat was taken care of, you should not have any structural issues with this model. We sold our's 5 years ago for less than the price you posted. I would not pay any more than $20 K for a 2000 268 Vista.
If you have anymore questions, just ask.