Question on How much I should pay for 01 xstar

So I found a 01 xstar for sale. Here is the down low on it. Hull has 1150 hours, he said it has a new motor that was a factory recall and it has 854 hours. He has no documentation of the new motor. He has only owned the boat for 4 years. Really no records on it. Interior is good, carpet needs to be replaced. No perfect pass. I haven't seen it in person yet but he said the Gel coat should probalbly be redone.

He said he around the 18k mark? is that too high. Obviously I would have a shop completey go through the whole boat but where should we be at price wise if the shop says its good

My big concerns are the history of the boat and no records, I could call Indmar with serial number on new motor to check to verify I suppose. Also having a Complete Gel coat on my last boat I know the cost is huge. I'm hoping once I see it just needs to be wet sanded cut and buff which would be way cheaper.

What do you guys think a good price range should be to pay. Don't want to over pay but I don't want to screw the guy either.