Frost Bolt, Something Else, Frost Bolt, Something Else.

So it becomes a two spell spec.
Frost Bolt, for the buff.
Something else to use it.
Then back to the primary spell, with the uber buff.

For the shammies who say, "There won't be a reason to bring me anymore."... well if its player skill vs player skill, that assumes a fairly even playing field as far as relative dps goes.