Summoner Build

I have been playing around with Summoner and I had an idea:

http://www.pathofexile.com/passive-skill-tree/AAAAAgMAVysHY-aBwFRzU2vbfRjsinkDMYgI9BFQfdIi9GwLDY0c3JMnv5fJPfIe3Fefex6UtAxGcbB36ro0CjyOV8k3gyj6gsfT-xNsBklqrPnoR7eGAlXVi3qnK9-wksGOvhEtfIPN-riTpwjZCyqY-oCdrhpsGYUkqjbp42qmrIhAkDOsP0GHtz7-v_ouewczVrelGDy9J5M64YgdqvrSFy9k51XWgKR4un_GJ6labSQ8p1xJUYbR

I got a lot of the mana nodes because all I want to do really is sit back and just summon creatures. Got some mana regen too. Got some of the aura nodes because I think it might be possible to get clarity and discipline to work at same time. Might need some clarification on that though :D

I didn't know if I should get pure life or pure energy shields so I put some points into both. Should I use both or only focus on one?

Another thing is should I get some more dexterity? Focused mainly on STR and INT and I am not sure if that a good idea.

As for skills I was thinking :
-summon skeletons
-summon zombies
-summon spectre
-summon raging spirits
- discipline
-clarity
-bone offering


Opinions (Which will all be negative and that I am almost positive of :D) criticisms, tips, advice all are welcome.