Saw somewhere that Israel took possession of 500 bunker buster bombs that we sold them a while back and they have taken delivery of some heavily modified F-16's with increased on-board fuel capacity in addition to drop-tanks. They can easily fly to Iran and return without refueling.
I don't believe that we will settle for only bombing Iran's suspected weapons development sites. If we take any military action at all, then it's going to involve both taking out the weapons sites and bombing all conceivable regime targets.
I don't think we're going to take any military action that has a result of leaving the Iranian regime in power.
I don't believe the Israeli's can fly to Iran and back without refueling. They would need to refuel a couple of times if not three times.