I think that the dsg/dst vs. 6mt. will be all personal preference... some people will swear by the new dsg/dst and vice versa, same situation as the e46 with the SMG2 v. 6mt.
As for the navigation I like it built in, because I believe that it looks cleaner, I do see your point of the system getting outdated, but our family has a ml 430 with built in nav and it’s just as good as the one in my moms 750 or my dads Continental GT even though its 3 or 4 years older.
now for me, my idea e92///M will have the basics, I have yet to make up my mind about DST but, I want it to be fast and handle as well as possible (duh) what I’m trying to say is that I want the combination that will get me around a track fastest.
