Any car 10 years old I would have check by a mechanic...10 year old cars have problems sometimes...it depends how it was maintained. Low mileage is great...but if the car sat in a garage with no maintenence for long intervals, things can still fall apart.
As for the convertible top...if it is power...expect problems. If there are no problems...be happy.
Everything for the top is expensive...buy a Bentley, learn how to troubleshoot and fix things yourself. Find a place that fixes convertible tops and be really nice to one of the mechanics...
(I don't mean that in a weird way you perverts)
thats my $.02