I am buying a 2013 soon. There are two ways to go. I could get a sahara with nav built in or get a sport S (without nav of course) and take the money saved and buy a lift and tires/wheels. If I get the sport can I just get a 430n off ebay (I see them for like $600) and plug it into my sport? I would make sure it already has the connectivity package.. but is that all I need?