I have found a 1997 Ferrari 355 GTB 6 speed with around 14K miles and is in mint cosmetic shape. The 30K service (belts) need to be done and the service records exist for the last couple of years only where it was bought with a Ferrari certified warranty by previous owner. Car is silver/tan and everything is stock and includes tools/books. What should I offer on this car to be a fair price? Thanks for your help!