My guess is around $3500 with trailor and wheels. A trailor box would be a bonus. It all depends on finding a buyer. A buyer for an I18 would be hard to find. Too nice a boat for your day sailor person. Too behind the times for a racer. Your target audience would be someone who wants to move into an F18 but knows they aren't quite ready for a 15K boat and might buy yours to get some time on the water.
Mike Hill