We were just told today that our minivan has a cracked crankshaft -- in other words a terminal illness. It has 123,000 miles. The million dollar question is to find an old one to put in ($4000), rebuild ours ($5000), or try to buy something else. We were trying to get more life out of the car in order to save more money for a downpayment.......this day just came sooner than we were thinking. Any thoughts?