I found a rather nice relationship between some passive and active skills. I don't claim for an instant to be the first to have found this but I thought I'd mention it to those who might not have seen it. I'd be very suprised if that hasn't been mentioned before but a scan of the first couple of pages yielded no results.
The relationship lies between Energy Armor with prismatic armor rune (active), Astral Presence with (passive) and Galvanizing Ward (passive).
By taking all 3 you gain the following:
+2 arcane power generated per second
40% boost to resistances
65% boost to armour
310 life per second while Energy Armour is active
Energy Armour duration boosted to 4 minutes
You negate the -20 arcane power from Energy Armour due to Astral Presence.
Admittedly it takes two passives and 1 active skill slot to do but it seems pretty big boost in defensive stats to me. I don't have the beta so I'm kinda going on just how the skills are worded but I can't see a reason why it wouldn't be accurate.
Just thought I'd share in the unlikely event it's been missed.