Looking seriously to buy - 07 convertible. 2LT package, auto tranny, dark blue metallic paint. I would rate cond. of interior and ext as 9 out of 10.Two tone interior package. Aftermarket exhaust sounds good, tires good, 60-70%, Bose system. Drives straight. 51 k miles. No navigation. Dealer asking 27.6 k for it. They have had it a while. May upgrade my c-5 to c-6. Any thoughts would be appreciated.