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Keep the boat. You have nothing to loose at this point. Cut the area of intrusion open and see how much you can get to drain out. Also drill a series of holes along the keel every 6" - 12" starting from the stern and work you way forward until you no long have water seeping out. Let it sit out of the water for a couple months in temps above the freezing point and then patch it up and paint the bottom. If it floats just use it. While you do that you can always be on the look out for another Whaler.

Or, if you really wanted to do a complete refurb you would have to head the route of Tony Boy see here:
link