Larue Classics Insurance
They are in the list of sponsors on the left. I have a agreed value insurance policy, and yes, I'm fully insured. You can specify various levels of coverage based on the number of miles you drive each year and the value of the car.
I didn't like the options with Hagerty when I talked to them, they were way more restrictive. Similar with Grundy. I really liked speaking with the Larues when I called them... Definitely worth a phone call.
Good luck.