Re: Should I or shouldn't I?
Starcraft Super Sport. They were made in an I/O configuration and an outboard configuration, in a few different lengths. 18' is pretty common. They will sit 7 people, or whatever the max weight rating is, tow a tube just fine, and because of the simple design , it makes them very roomy for fishing. The I/O version would most likely have a 120/140 mercruiser which is very reliable and common to get parts for. Aluminum hull makes for a light boat, easy to work on.
Keep in mind, any boat you look at for seating capacity figures each passanger weighs 150 lbs, so if you know your passangers weigh more, you need to go by the weight limit.
i forgot to add. Stay away from Mercruiser 3.7L/ 465/470/485/488 engines. Good idea, bad design and lots of problems. Starcraft I don't think used them, but I know Searay and Imperial did. Not sure which other manufactures did