I'm still using
Chestplate of Stoicism over
Chestguard of the Stoic Guardian for more defense rating. that way, I can use the SSO nekless for exemple, that doesn't have any defensive stats to say, but hit rating and expertise.
Since expertise gives about the same threat output as spell dmg, but also reduce the income of dmg, and gives a more constant aggo, I really think it should be on the list, the chest and the nekless.
in our days, being exalted with scryer/aldor isn't really difficult either, and the proc is also one of the bets in the game, dodge or expertise.
do people share my vision of things?