I would reckon 17-18k is not a bad shout, perhaps even a bit optimistic. As we know options count for very little in real money terms but perhaps attract a buyer. Nav is one of the few exceptions which of course does add a bit of money. Wouldn't bother listing the items in your list above which are standard equipment, people get bored reading a list and can miss out on the things that are genuine extras that distinguish your car.
The market will decide its worth anyway once you post it up.