Don't think Heal will be useful at some point. We're already at level 21, and it only heals about 15-20% of your HP.

I'm thinking Fireball and Ice for sure (for freezing). Lightning wil be nice one gear has some crit to it.

I'm not sure if Arcane Shield will be worth it. If it's that effective, I'll use it. If I use Fire and icebolt, I guess I'm really asking of which 2 I should use: Arcane Shield, Gale, or Time Shift?