Ah I misread your list. Thought you listed the abilities you already had and wanted to know which to upgrade.
I'd go EB so you can proc your Walking fortress even more. I'm assuming you're using fadestep or cloak for kiting purposes. Otherwise you'd need/want Cage.
yeah thats what i was thinking too, but its a tough decision ><
and yeah im using upgraded fade step for kiting/escaping/dps (first time using the upgrade, pretty impressed with the damage it adds along with stormbringer)
just finished my first attempt at solo threatening with the build, still have the 1 unused point.
got demons.
i won.

guess it doesnt really matter where i put the point lol
edit: and as im watching the video of the run, im starting to more seriously consider just grabbing the upgrade to veil strike.
running this build i try to make the most of the Conductive Current passive (5% damage bonus per 10% missing mana) by first casting barrier and then immediately casting chain lightning for a 25% damage bonus. the 65 mana cost of EB is really off putting since it would potentially not have a spot in my ability rotation...
whereas the upgrade to veil strike reduces the mana cost to only 20 mana and helps with crowd control.
i may just put the point there...
edit2: doh EB only costs 50 mana. it would fit perfectly.
hmm....DECISIONS ><