Olimint, welcome. Plummer's stuff is pretty accurate. Actually, with the economy in the shape it's in you can probably negotiate some better prices because everyone is desperate for business.
I seem to remember Plummer pricing out higher-end facilities in high-rent areas. May be from a different book or one of his lectures... Can't remember. BTW, if you haven't seen the guy speak, you are really missing something. He's an outstanding presenter!
Check out my buddy Jared's franchise model:
Go Performance and Fitness. Its a really solid business model that really resonates with my own training philosophy. It's relatively new so the set-up fees are still pretty low. There is franchise information on the bottom right shortcut.