I'd venture to say that pretty much every option is under consideration now. Unfortunately (as discussed on the Helen Thomas thread), that seems to consider the use of tactical nuclear weapons. The administration has publicly stated that that particular option is not off the table.
Opening any sort of campaign against Iran (including the air-only option) would most likely result in a battlefield roughly 2000 miles by 500 miles stretching from Jordan's eastern border to Pakistan's western one. If we were lucky, the Iranians would only respond in a conventional way (i.e. with ground or air forces), but most likely they would use their contacts within Hamas and similar organizations to declare open warfare on Americans where ever we can be found. I don't think that the US military is prepared to be fighting 3 spearate campaigns along with our other obligations around the world. I completely agree that nuclear-armed Iranians are a seriously bad idea, but so is any sort of US or Israeli attack (see Helen Thomas thread for more on that).
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