Even today Civ I reigns supreme, I have III and IV but they just don't compare with it
! And neither do Sierra's Empire Earth nor Microsoft's Age of Empires I to III though they are good especially AOE II. And then there's the Age of Mythology series. I just discovered that I had 1503 A.D. lying with me. It's looks like Colonization (have you played it, it too is very, very good?). I haven't really tried 1503 really, just started but that's all
.
Happy Gaming and Peace!