Templar - Ice Elemental / Two Hand Tank

Lemme know what you think of this build, and what I should change.

With 111 Points:
Strength = 232
Intelligence = 242
Dexterity = 104


I went for Staff/CritChance/Resistance/Ice in this build and this is what I came up with. So far (lvl 37) its been doing really well, lots of health, can one shot pretty much everything, and can take out mobs with ease. But as I am about to finish Act 3 on Normal, I am wondering what this build will be like at higher difficulties. Any advice is welcome.

Skill Tree:
http://www.pathofexile.com/passive-skill-tree/AAAAAgUBBLMFWw9UES0UTRb5GF0aOCkHKS4pTyycMoky0TNANDE26TwFPC09D0NjQ3lEckVHRY5G10z_TdhUkVfiWPVdxl6fYG1jC2ZPZp5moGebcU12EXflfEt8g3y7fVN99YFJgW-Cm4M4hMSIOIp0i4yMdo6-j0aQVZMHlwGaz52AnYqdxJ48n9-iAKcIp4SpaK9sr3OyOLUEtoa3MbdyuJO53b05wBrALsG0xBXE9sWKyWfMt8360TXUj9V12aLdBd3z4XPjauTs6XPsGew47SDvDu988B_yL_LO83H60vuL

I have also heard that tanks are pretty much useless at higher levels, which I hope is not true, so if anyone has experience with tanking in higher difficulties, please give some advice on if I should continue with tank, or lean more toward spells.