P.S. That insurance quote you got is triple what it should be ! Perhaps it's because of your age, but you might want to have them twiddle with some of the variables (deductibles, etc.) to see if you can bring it down to a reasonable level.

P.P.S. As I said, decent later SECs (the most desirable 560s are the 1989-1991 cars due to an interior facelift & more luxurious appointments) start at $15K, and the lowest mileage ones go on up to the $40K range. I know of a black 1989 model that sold last year for $40K in northern California; it had 14K miles on it.