Up until Galactic Civ 2, I'd always got back to SMAC whenever I wanted to just play a great "one more turn" game. Even after GalCiv2, I still go back to it.Thank you GOG.
Seriously, just about every time I go in a local Five Below, I see about 30 copies of this game. You could get two great games in the series for $6, or this one for $9.