Can the cost of war with Iraq (and its aftermath) be estimated?

"CBO estimates that the incremental costs of deploying a force to the Persian Gulf would be between $9 billion and $13 billion and that prosecuting a war would cost between $6 billion and $9 billion a month -- although we cannot estimate how long such a war may last.

After hostilities end, the costs to return U.S. forces to their home bases would range between $5 billion and $7 billion, CBO estimates...

Further, the incremental cost of an occupation following combat operations would vary from about $1 billion to $4 billion a month."

"The Full and Total Cost of a New War with Iraq is Likely $100 Billion to $200 Billion:

The analysis concludes that a U.S. force of 250,000 personnel that achieves the goal of ousting Saddam Hussein’s regime in 60 days of combat that goes as smoothly as the Persian Gulf War will cost $93 billion, including interest costs.

When all of the other costs that would also be incurred...are considered, the total would easily exceed $100 billion. And if the war has an adverse impact on the U.S. or global economy, or proves more difficult and lengthier than assumed, $200 billion may unfortunately prove to be a reasonable estimate."

"...[the] cost of a war with Iraq could be in the range of $50 billion to $60 billion...

Mr. Daniels would not provide specific costs for either a long or a short military campaign against Saddam Hussein. But he said that the administration was budgeting for both, and that earlier estimates of $100 billion to $200 billion in Iraq war costs by Lawrence B. Lindsey, Mr. Bush's former chief economic adviser, were too high.

Mr. Daniels declined to explain how budget officials had reached the $50 billion to $60 billion range for war costs..."