I find it hard to believe saddam had nothing more sophisticated than the rpg7.
Like the SA7's, it would be available but only in limited quantities. The best time to use any weapon like that is obviously now, not in a standing fight they knew they'd be killed before they could get a shot off.
Think about it. Iraq was facing one of the best equipped invading forces in the history of war. If they had put up everything they had when we rolled in, it wouldn't have taken much longer than it did. We are a country that has a history of going into countries, but leaving when things got tough. Why not plan to make the invasion easy, and then use your more sophisticated weapons in a terrorist fashion?
Shoot down a couple aircraft, blast a couple of tanks, hope we get antsy and leave.