You should seriously look into Grundy or maybe Haggerty insurance. Little known fact is that they will insure all your cars not just classics or limited use cars and the entire policy is super cheap. I have 4 vehicles including the box with full coverage and the 6 month premium for all of them is $772.
I have State Farm for my 98' Boxster, 13' Nissan Altima & homeowners.....I just got my 6 mo. premium notice for the Boxster ($218) full coverage on both cars w/$500 deductible.
In total for both cars and the house I pay $1,200/yr
I have a policy for my 1967 MGB with Hagerty and added the 2004 Boxster to it. Cost me about $550 a year with an upgraded towing package. Good folks to work with.