Higher levels of Ice bolt add some additional damage, although it's not listed. It also feels like the success rate of slow is greater to me for higher levels.
I feel that the only really useful empowerment to AoE spells is cooldown on inferno (it doesn't let you empower the damage anyway, unless that's been fixed)
I suggest leaving magic missile, magic burst, ice nova, firebolt for chain purposes, and dispel (while it is still bugged and dispels any grade of debuff) at level 1.
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