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Using the single nuc against a power who controls multiple nuc's is a losing proposition, and the radicals who intend to create one world-wide, Islamic Caliphate do not intend to lose.
Iran needs multiple nukes. However, when they have an adequate supply and ballistic delivery system, they WILL use at least one to prove their point. In the mind of the madman running Iran, a nuclear first-strike would establish Iranian (and Shiite) dominance over the Islamic world. It would put Iran at the tip of the spear of a prophetic confrontation with the West. It would prove to Muslim's everywhere the strength and righteousness of their cause. The first strike could be Israel, but more likely, Sunni or Kurdish Iraq, more than undoing everything the USA has done over the past three years.
THAT's why an Iranian nuclear power is the most dangerous concept since Hitler in WWII. They have a strategy to defeat Europe and the West, they increasingly have the means to act on it, and they have absolutely no Western (read "Judeo-Christian") concept of morality. You absolutely cannot change the behavior of people who believe the murder of innocents is god-ordained behavior, and are willing to sacrifice the world to prove it. You have to kill them.
SFS
Good points, both of ya.
They could get off a few first strikes, but then they are toast. I remember reading recently that Iran imports 60% of its refined oil. Logistically, they have a huge problem.