Cook rice according to package directions to make 3 cooked cups. Drain artichoke hearts and reserve marinade. Chop artichokes and set aside. In a large skillet, heat reserved marinade for 20 seconds and add onion. Over medium heat, cook onion until dark golden brown, about 3 to 5 minutes. Add sherry and wine and bring to a boil. Add shrimp, basil, salt and pepper and cook for 5 minutes. Add crabmeat, tomatoes and cooked rice, tossing to mix evenly. Serve hot.