Reddishrecue, also consider the new expansion that hits the stores this spring.
Even on paper, the new religion and espionage systems make Civ IV's ones obsolete. Actually I don't know a single IV player that loves either of those..
With Civ V you get a Civ game that gives proper treatment to WW1, making the transition between the modern ages more smoother. (after expansion that is

)
With Civ V there's also the fun Cold War part with city-states.
Also many of the small details of IV I really dont miss. Pollution, building transport ships.. don't need those.
Civ IV is a great game, but I think Rhye's and Fall Mod is the best thing on it, and Rhye is creating a brand new one for Civ V.
* * * *
If I go out to a bar on friday, next morning I'm gonna wake up 100€ poorer, with a headache feeling like Naresuan's Elephant stomping my head and listening how my wife demands me to get up and go to Ikea with her, when all I would like to do is sleep and dream about the upcoming Gods and Kings expansion for Civ V, where I'm the true ruler and decide if Ikea shall prosper or burn to the ground.
So.. 30 euros is such a small cash for a game with hundreds of hours of enjoyment, and with the upcoming expansion a silly amount of new stuff.
