There are lots of other options. And, while they like their fiery rhetoric, the regime in Tehran has done little to suggest that they are not rational.
Apart from the ethical and strategic objections to the course of action suggested, above all I feel it would be counter-productive. Even if it didn't provoke further nuclear exchanges on a state level, I'm sure that someone would find a way of delivering retaliation in kind to Israel.
I have no ethical objections for the use of tactical nuclear weapons especially with a nation(Iran) threatening to use nuclear weapons to make war upon her neighbors.