I have State Farm with a stated amount of $18,500 for my car.  I did have a local car appraiser look over the car and got an appriasal from him.  I sent the appraisal and lots of pictures to the agent and got my stated policy.  It cost around $85 every 6 mo.

Hagerty refused to insure my Z during the phone interrogation after i said its possible i would take my son to the ice cream shop.  I do have a daily driver for each member of the family.  They also said that hypothetically if i did insure the car and then experienced a loss while doing something like daily driving they would deny the claim anyway.  It seems only good for insuring cars that don't get driven.

 

Ultimately i just called my insurance company and got a policy on agreed-value.  Note thats not the same as stated value, make sure you understand the difference before buying insurance.

This has just been my experience, but If you follow the rules set by most agreed-value insurance companies (sparingly drive your car, store it indoors, fawn over it) then most of them will gladly insure your car for top dollar, because they make more money that way.  I'd also venture to say that owners of top cars who want top dollar insurance are probably statistically less likely to put their car repeatedly in a situation where it will get damaged.  This makes it an even better bet for insurers.