The only problem I see with this is that you're using frost. Frost gives you more control vs. melee opponents, but there are things that can prevent it from becoming effective at all....Free action potions for one.

I'm going fire/arcane. For my final talent I'm deciding between Presence of Mind (next spell with a cast time < 10 seconds becomes instant cast), or combustion (next fire spell is a guaranteeed critical). So far I'm loving fire, and have no problems with any melee chars I've fought. You should give it a shot.