Hope this helps!
I have a 1979 H25 which I purchased in the fall of 1996. Mine was in quite good shape when I got it, so did not have many problems to deal with right off the bat other than cleaning and redoing the teak. However, some of the questions you asked, I can help with. You asked about the iron sail, I have a 1981 Mercury 9.8 and would not go smaller in size. I sail Lake St. Clair, Lake Huron and Lake Erie. The motor is just enough to push the boat into a stiff breeze with the associated waves. Also, I have both the Detroit River (approx 3kn dead center current) and the St. Clair River (6kn dead center current in spots) to deal with and this taxes my motor. Long shaft is a must, if you want to keep the prop in the water in a chop and I do know that the Potomac can kick up especially around Colonial Beach. As far as refinishing of the non-skid goes, I had mine done professionally 4 years ago (approx cost $375 plus materials)and it still looks good except on the cockpit floor. There has been a lot of discussion recently on the Hunter Web (hunter-list@sailnet.net) concerning this and some really economic ways to do this including using Home Depot's best semi-gloss latex enamel with non-skid micro balloons. This Web Site is another real source of information. Rigging is another matter yet. I have tried the eyeball method (ie tight windward, just loose leeward in a good breeze) but do not like the guess-work involved here. Quite frankly, I use the Loos Rigging Gage (sold by both West Marine and BoatsUS) and use the values suggested by them. Set up with slight aft mast rake (approx 5") for most of your sailing. There is a manual on the 25 which can be purchased from Hunter Marine or which I can copy and send to you. It is a help in understanding your boat (it's electrical circuitry, plumbing, etc.). Other comments concern: a. the ability to access the mounting bolts and the cockpit drain fittings. I finally cut a hole in the aft lazarete tray (12 x 18) for access. There is also a removable panel at the aft end of the port bunk; b. the single aft cockpit drain which provides for slow drainage of the cockpit should you get pooped. I made the boat single-hand friendly by adding a roller furler and running halyards back to the cockpit. Sure saves getting on deck when you really do not want to be there. Lazy jacs were there when I purchased the boat, but I am still not sure if these are help or hinderance. All in all, it is a great sailing boat, easy to handle and tough in the clutches. It is somewhat tender up to a heel of about 15 degrees but, at that point, hardens up and sails like a dream. I have had mine out in some pretty nasty weather, and "Whisper" handled it light a real champ. Cut my boating teeth in your area. Bought my first boat at the Colonial Beach Yacht Club (on the point)and kept it at Dahlgren. The lower Potomac and the Bay were my stomping grounds. At least until, DOD, in all its infinite Wisdom, decided to transfer me to the Detroit, Michigan area.