Magi stop playing blm..there is a child's play reason why you open with blizzard 3. Not frigging blizzard 1.
All you gain from blizzard 1 is the reduced fire 3 damage but no increased cast speed you otherwise get from blizzard 3.
Now get out.
And in the end it doesnt matter if you open with blizzard I or III - If Blizzard III takes the 3.x seconds to cast or the Fire III - you will not get faster to your first Fire I then i do