Re: 3.0 Enough for a 19' Boat?
What pitch prop do they have on it? With the right pitch prop, if the boat is a light 19 ft, it could actually pull up a slalom skier OK -- but this would be a low pitch prop and you would be loosing a lot of top end cruising speed. They have a tower on it, perhaps they have a high five or some other prop to compensate for the lower HP? Either way, it would pull a tube, wakeboards, double skis, and kneeboards just fine, so what you are most worried about is getting slalom skiers out of the water. Then again, I learned to slalom as a kid behind a john boat with a 35 hp.
Nada values shows their 1997 19 footers coming in a 2215 lbs. So, this is a pretty light boat. However, they show the standard motor as being 190 hp (4.3), which should lower what you pay for it.
If I were you, I would not rule it out. I would drive it, or even ski behind it, and see how its set up. Pay attention to how quickly it gets on plane. Bring a heavy buddy along for the test ride. See how it does under weight. If its OK, then low ball them, because of the smaller motor, and the end of the season (needs to be winterized, tuned up, etc).
If $5000 gets you a well maintained boat that looks sweet with a tower, then you are on the water next year. If y'all love water sports, you will be looking to upgrade in a couple of years anyway.
Either way, read a little about props before you go test drive it.
Best of luck to you!