The Third World War is probably my grail game. I played it many times in high school, from the Northern Front through the Balkans. My copy of Persian Gulf was missing the political rules and, in a pre-interwebs era, that was a show-stopper.
In more recent years I have played the monster game through (with the Persian Gulf political rules, thanks to BGG and friendly gamers) a few times.
So this was an auto-order as soon as I heard about it two years ago.