That is only one side of the equation. What is the cost of not fighting a war with a non-nuclear Iran while we still have that option? What is the cost of fighting a six day war to eliminate their entire nuclear infrastructure so that they have to start from scratch on everything material in their nuclear program, and then leaving without any long-term effort at regime change or nation-building?
Iran would attack Israel first.
There would not be much Iran left for us to deal with.
Why is everyone on Free Republic so excited about going to war. Perhaps you all need to go to the local VA hospital to see how we wage war now.
Iran is not a threat to us. Let the Kingdom and Israel deal with them.
Lets take ten or twelve years without invading someone and see how that works out.