Irrespective of which decision you make (and it all depends on how much you value the extras you are getting for your money), you appear to have ordered the car with the dealer, therefor it may be difficult ordering the car, if it is to be factory built, with the extra pack, without loosing your original order date.
You may be better, to ask your dealer how it would affect your already ordered car and if it would now affect the delivery date. If it has not been built at the factory yet, it may not make a difference, however if I were you I would check first, before I decided to get the extra pack.