What is the going price for the 1967 Volkswagen beetle completely restored?

There is really no way to tell you a good answer to this. You can check an auto magazine like Hemmings Motor News for prices of other similar condition cars, but really, a lot depends on whether the restoration was amateur or professional, the mileage of the vehicle, the area of the country in which you live, etc. I would do a comparison shop of Old Car Trader or Hemmings first to make sure you are not grossly overpaying.

Best place to find the current value for old Volkswagens is at http://www.thesamba.com