I have fond memories of civ III

Hogging the oil and aluminium then building armor + boats then launching a massive assault on the other continent and everyone occupying it. Good fun, i could never get into civ IV though, religions wrecked it for me, you have to pick one that the other most powerful civs have otherwse they dont like you and you better hope no other religion spreads in your cities because youve got no way of outlawing it or anything. Nah it just bugged me.
Still to try civ V though so maybe ill like it better although i doubt ill like anything better than alpha centauri.