For The Love Of Port

I was wondering if anyone had suggestions on Portuguese table wines which I can pick up State side that have the ability to show well 20 plus years down the road. My son was born in 2011 and he only has 2 case of non fortified Portuguese wines in his collection (1st world problem I know) so I wanted to added a few more selections to his library. Thanks in advance.
I will get the names of the current cases to add to this thread in the coming days,
Cheers