I have Grundy agreed value collector car policy on my Callaway Carbon Z06. With only 3 in existance, it really is unreplaceable.
I don't have mileage restrictions like some other collector car policies, and while it says you can't drive to work or "run errands", who's to say I wasn't out cruising & needed to stop by Home Depot
I pay $1,063/yr for a $95k policy.