what insurance company to use?

[speedshftr]

ive had nationwide on all my cars for about 20 years now but id like to get some sort of agreed upon value.the car is almost done and i only have it insured for 8gs.id like 45k worth of insurance and mileage caps are not a concern cause i dont drive much.i had a dui in 91 and have only had mabey one ticket since then.for the record i have not drank in over ten years.car will be strictly used on special days and kept in a pretty secure building away from my house.my interior wont be done for about two months so i was hesitant contacting an agent.can the car be fully insured even though its not done.would i need all my reciepts if anything ever happened?thanks guys i remember msa? had insurance problems.just looking for some good advice.im located in delaware