So Civ IV and Civ V are on sale at steam and I want to get in on it, but Im on the fence over which to get. Civ IV is $7.50 and comes with all the emanations and Civ V is $30.00. I don't how outdated Civ IV would be compared to V, but IV's cheeper price makes me much less weary of the purchase as i wouldn't feel like it would be such a blow to my wallet. To anyone who has played these games I'd like to know your opinion.