you seem to have thought about the question already and I would say there is no bad choice.
Plus, if you change your mind you can re-sell your Submariner quickly without losing money (welcome to the Rolex world !).
Concerning the vintage Submariner, don't forget it is a toolwatch that was used by the french and british navy: It shoud resist basic outdoor activities...
I think the servicing question is a wrong problem: how do the people who collect vintage Longines, Movado, Universal, etc... do to have their watches serviced ?
Of course I understand that for someone who is used to modern watches, the vintage pieces are always scary at the beginning...
Cheers
Jeff