Viable Scion mana tank?

I am working on a Scion mana tanking character for the new rampage league. This is what I have so far.

http://www.pathofexile.com/passive-skill-tree/AAAAAgABCGcYPCHDKPpBh0rIV-GBr4LHguSKr5ARkNaTOrEFtz640L0nvrzYvdo6-WX56P4K

Right now I use glacial cascade/freezing pulse and molten strike to good effect. I am looking to get eldritch battery, iron reflexes and mind over matter so that I can mana tank. This is my planned route to get there...

http://www.pathofexile.com/passive-skill-tree/AAAAAgABCGcNfBUgGDwY2xzcIcMo-imlKk0qUyzpQYdFnUZxSshOKlFMU1JXyVfhW69ilW-edPF9W3_Gga-CHoLHguSDCYUyiq-QEZDWkyeTOprgoqOsR7EFsnC0DLc-uNC9J768wfPKSti92jrbC90N6rrr7vll-ej-Cg==

Does this look like a good route or am I using up too many passives traveling to iron reflexes/mind over matter? Which other nodes should I go toward to round out the character? Mainly life and increased dps I would think since this should cover most of my defense.

No one has a thought?