What a coincidence, I also am a huge fan of Sid Mier and his Civilization series. Wait, what a larger coincidence, we're on the same team! Wait, why am I doing this online then?

Other decent games are:
2)Age of Mythology (If you straighten out the .DLL file problem which I haven't, so its a very nice paperweight)
3)Shattered Galaxy (Former lvl.70+ overlord)
4)Any sort of mech game that isn't an arcade rip-off (Anything made before 2002)
5)Battlefield 1942 (killed a man just to watch him curse me off in the chat box)

However CIV III reigns supreme and is unchallenged in its glory.