How this for a PvP Frost spec?

http://db.vanillagaming.org/?talent#ooxVcobZZVVGIsbt0o
I'm not really sure if Improved Blizzard is necessary at all? Otherwise I could go with maxed Cone of Cold?
http://db.vanillagaming.org/?talent#ooxVcobZZVVGIobtho
I'm not really sure if Improved Blizzard is necessary at all? Otherwise I could go with maxed Cone of Cold?
http://db.vanillagaming.org/?talent#ooxVcobZZVVGIobtho