I was not aware of the tempest boost to AC. As for the shield clicky, I don't like to count it because of its short duration, but I suppose that does technically add 4 more maximum possible AC. If you make a build that can UMD higher level wands, then certainly it becomes much more viable.
Also, it would probably be wise to raise dex higher but the question about what his AC would be with or without CE was for a given set of stats.