I don't think there is anything wrong with the Hunter from a design/build perspective. Condition is really the issue. And you like the boat.
Rather than spend money on a survey first, do a pre-survey to confirm condition.
Buy or borrow a good moisture meter - a lot less expensive than a survey.
Understanding the Moisture Meter / Electrophysics CT-33 Photo Gallery by Compass Marine at pbase.com
In addition to helping before purchase it is handy to have during ownership for regular checks.
Have you looked at this link? Boat Inspection Trip Tips
Other questions - How old is the rigging? Has the boat been upgraded over the years or is it close to original as far as electronics and other items? A boat that is kept up to date by the owner may be one where things are looked after better than one that is clean but original. Engine maintenance log and receipts are other items to ask about.
Hope this helps.