Well, there are several classic auto insurance companies. Unfortunately, I don't have any experience with any of them, but they might be a viable option too. There is Classic Insurance, classicins.com. I don't know what Diablo you have, but a $150,000 1997 (I was thinking roadster?) driven 1000 - 3000 miles a year, with none of their defaults changed would run about $2,800 a year. I'd just start doing google searches and see what you come up with. Hope this helps.