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Really depends on what you want. Have a Whaler that you know and rigged yourself, including the tank if required, or pay a lot more for a boat and motor you hope is worth what you spend.
Personally the scum line and small crack at the transom would not make me walk away. The scum is from wind slap of water on the hull more than likely. Cracks are not severe and simply show what happens when you attach stuff to a boat that was not part of the original design spec.
Just guessing, but I bet Whaler saw some cracks when they starting offering brackets, just as part of the learning process.