Suzuki 4 stroke, worth even more.
I have heard a lot of complaints about the performance of the 4 strokes on some hull designs, it seems the extra weight of the 4 stroke motors tends to but the bow up and stern down.
you will have to find someone with the specific hull/engine combo to know how well a boat will perform with the heavier 4 stroke.
some hulls may be specifically designed for 4 stroke motors.
I have heard that the new yamaha 4 strokes are much lighter.
some small boats like a 14 carolina skiff need a 20% bigger 4 stroke just to get on plane.
plan on installing trim tabs on any boat with a 4 stroke.
having said that the 4 strokes are wonderfully quiet and get better gas milage.
4 strokes may be more expensive to repair as they are more complicated and there are more parts.