I have done a little reading on this subject and tried a few different brands.
Hirtenberger is good quality and available, but Portuguese seems to be getting the nod lately by a slim margin. Supposedly slightly more consistent and accurate. I am not a sub-MOA shooter, so I can't tell the difference.
The Hirt I have been buying is headstamped '79. The Portuguese I have bought is three years older, but both come in sealed battle packs and look new when you open the pack.
Ammoman has some Portuguese right now that has a 146gr. match bullet instead of the usual 147gr. FMJ. Have not tried that one, but it looks interesting. Made in '70. Shipping is included in price.
http://www.ammoman.com/images/PORT_3.jpg
Bob Lippman has Portuguese at a great price, but that price does not reflect shipping costs. Don't know if it is the same stuff that Ammoman is listing.
http://www.lippman-enterprises.com/ammo.html
The big unknown is how much heat the ammo has been exposed to in twenty or thirty years of storage. Every case you buy may have a different history.
You definitely want to avoid Cavim. It is crap.
Radway Green is supposed to be good, but I have not tried any.