It would VERY hard to buy a port thats not from Portugal. (it doesnt come from anywhere else)
If you are looking to have a KILLER drinking port, that even comes in half bottles, so you can buy a few and get a feel for them, go for LBV ports, most of the finer Port houses have at least one LBV. A LOT cheaper than going for their big gun older lines too.
Jackangel: funny you should say that, My brothers old studio on broadway back in the day shared a floor with Rick Rubins place and I used bump bald heads with Run & Co about twice a week.