A word of caution about agreed value. You and the insurance company can come to an agreed value for your vehicle BUT the agreed value only covers the vehicle for a total loss. Smash a fender and even if you have agreed value it won't help any more than conventional insurance.
Up here in BC we can get agreed value from our one and only insurance company (the government) and you pay an extra premium for that albeit not very much. This is over and above what you would normally pay.
For my truck (without agreed value) basic liability, fire and theft, broken glass costs me $550 per year. If the truck was better than mint I could get Collector car insurance for about $250. My truck is not mint, its a driver so they won't even consider Collector Car insurance. Having said that if you have a Model A with fibreglass fenders you can get it and now the specialty vehicle association is lobbying to get brand new builds as collectors - even with glass bodies.
