About $45 billion, of which about $20 billion will be paid for by American taxpayers.
Given the relative instability of the regiemes we're selling to, and the fact that Egypt, without regional enemies trains for a ground attack on Israel, air assets to be supplimented by the Saudis and other Gulf states, this does little more than add to the instability in the region.
An Iran-Saudi struggle, unlikely as it proceeds through Iraq, will be decided by American forces. As was the Iraq-Kuwait-Saudi struggle.
Neither Egypt nor the Gulf states will use their Air Force against Israel. Even Israel declared today that they are OK with the arms sales to Saudi Arabia as I indicated in post # 40 on this thread.