Good Ice Mage Spec?

[ukerawr]

Arcane (17 points)

2/2 Arcane Subtlety
3/5 Arcane Focus
2/2 Wand Specialization
5/5 Arcane Concentration
3/3 Arcane Impact
2/2 Improved Counterspell

Fire (0 points)

None

Frost (44 points)

5/5 Improved Frostbolt
5/5 Ice Shards
3/3 Frostbite
2/2 Improved Frost Nova
3/3 Permafrost
3/3 Piercing Ice
1/1 Icy Veins
2/2 Arctic Reach
5/5 Shatter
1/1 Cold Snap
2/3 Improved Cone of Cold
5/5 Winter's Chill
1/1 Ice Barrier
5/5 Empowered Frostbolt
1/1 Summon Water Elemental