Re-Rollin' w/Shammy

Well, after much thought. I decided to roll a Shaman. Here is what I'm looking at for a build...
Elemental (43 points)
Convection 5/5
Concussion 5/5
Call of Flame 3/3
Elemental Focus 1/1
Reverberation 5/5
Call of Thunder 5/5
Elemental Fury 1/1
Elemental Precision 3/3
Lightening Mastery 5/5
Elemental Mastery 1/1
Elemental Shields 3/3
Lightning Overload 5/5
Totem of Wrath 1/1

Enhancement (18 points)
Ancestral Knowledge 5/5
Shield Specialization 5/5
Guardian Totems 2/2
Improved Lightning Shield 3/3
Enhancing Totems 2/2
Toughness 1/5

Thoughts? Ideas for Improvement?
Thx:)