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The Whirlwind ability doesn't also make the elemental (or caster) incorporeal- which seems to be what you're looking for with respect to defensive abilities. It already can move through and attack 40 squares (double move with a move of 100) without provoking an AoE. And drop anyone it picks up from a fatal height one round later.

What more are you looking for here? ;)

With respect to Whirlwind, why wouldn't it be half the druid's HD plus the druid's strength bonus for DC?

Barring that- use the spell effect level (Elemental Body IV) and the druid's STR bonus as opposed to the WIS bonus. It seems a reasonable take that since the Druid *is* the Air Elemental in question, a STR based DC is appropriate.

For sake of awesomeness, I would let a gunslinger lasso an air elemental whirlwind. Not because it makes sense, but because the vision of a gunslinger riding a whirlwind akin to breaking a bucking bronco is just too amazing to pass up.

Point Blank Master + Improved Snap Shot (Threaten 15' around the character) + Combat Reflexes will turn any Archer worth their salt in to a Hedgehog.

Any spell-caster not casting defensively provokes an AoO when within 15' of the archer and 1d8+XX can severely cramp their spell-casting style.