http://en.wikipedia.org/wiki/List_of_war...%80%931989
The above URL is a list of "official" wars between the End of WW2 and 1989 (Fall of the Soviet Union), ie: the Cold War.
I could go for Greece vs Albania in '47 or '48
Portugal vs India in '61 ( yes, I'm still trying)
Egypt vs Saudi Arabia '62 to '70
China vs India in '62.
All of the above have flaws as far as play balance, so we would have to agree on what is fair and balanced before getting started.
I have slot 3 open and look to have the time for another game.
If you want to try something really different in 1972 the Chinese gave North Vietnam a bunch of tanks and tracks and sent a corp sized armored force south. It was smashed by US Air power and a small ARVN force. I would have to be something like a dozen air strikes supporting an infantry battalion against a Soviet style Motor rifle regiment.
Look thru the wikipedia article and if something catches your eye, let me know.