I don’t think there is a real book value for an older boat like the 450DA. The over all condition and deferred maintenance items can make as much as a 50% swing in selling prices. NADA gets is sold data from voluntary dealer reporting. On older larger boats, there are not enough of them sold for there to be statistically accurate price guides. That means some of what you are relying on is from interpolation or just plain guessing. About the only way to determine a real value is to go look at a number of different 450’s, find the best one for you and make the best deal you can on it. At that point, you should have a reasonably decent handle on what the various maintenance requirements are so you can get a decent estimate at what it will take to get the boat, safe, and sea worthy as well as bring the required maintenance current. It isn’t unusual to spend $25K-$30K on a “cheap” boat if you need to replace canvas, isinglass, sea water pumps, cockpit vinyl, clean heat exchangers, interior carpeting, etc. That is where the price swings come in. I saw a 450DA offered for $135K in Texas, but it needed absolutely everything…….My boat is kept under a covered slip, the fiberglass looks better than the 2009 in the next slip, all the electronics work as they should, canvas and vinyl are new, all maintenance is current, and I have the servicee records to support it. My boat isn’t for sale, but it would not be a $135K boat.
Unless you have some experience with marine propulsion systems in boats of this type, the cheapest $800 you will ever spend will be to get a Caterpillar technician to do a mechanical survey. While you may be a decent mechanic in your own right, these engines cost about $35K ea. So you don’t want to be guessing about their condition.
A bottom inspection before you write a check will not protect you from t he potential risk on the boat’s structure either. This is a cored hull boat and the deck is fully cored. At a minimum, you need to have a qualified marine surveyor take moisture readings from the rub rail down and be sure that all transducer installations are in the solid pads in the bottom of the hull. The deck should also be moisture checked around every cut or hole in the deck assembly for windlass, port lights, stanchions, screw holes for windshield mounting, etc. A wet and rotten core can be a really expensive repair.
The 350 hp 3116 is a great engine in this boat, if you don’t expect ski boat speeds. They are high torque diesels that make for a great handling boat around the dock and getting on plane. Cruise speeds will be in the 22-24 kt range and fuel efficiency is the plus side of the speed trade off. At recommended cruise you will get 22.6 gph….back it down to 75% power and you can expect 16-18 gph. Not very many single engine outdrives will do that.
Thew 450DA is one of the top 4-5 boats Sea Ray has ever given us…….hope it works out for you.