Dear Lord, don't even get me started. Haha, I have Civ III Civ IV and Civ V, and I actually bought a whole new computer so I could play Civ 5
I played the crap out of Civ 5 when I got it, playing usually on like 5th difficulty and just getting into 6th, when I kind of got bored and dropped back into MCSG. I tried to pick up Civ IV again a week ago but just couldn't overcome my love for MCSG and BO2, which is basically what I play right now. I'm sure one or the other will get boring and open up a new game for me to play.