I haven't played a Civ since II, but I doubt you can go wrong for $10.
http://store.steampowered.com/sub/1618/
EDIT: Or $1.25
http://store.steampowered.com/app/3910/
http://store.steampowered.com/sub/1618/
EDIT: Or $1.25
http://store.steampowered.com/app/3910/
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