Let the Israelis do it...
I'm sure they have a lot of old ordinance laying around they'd like to get rid of.
I like this option - let the Israeli's do it. With any help/assistance they need from us to make the strikes a complete and total success.
We are closer. We have far more forces. We have far more legitimacy with the opposition inside Iran, which remembers the US as a staunch ally under the previous regime. In case everybody forgot, this is our mess.