You mean for set bonuses and stuff?
AA has a pretty big radius and usually enemies will try to run out of it's AoE away from you.
I can see that, even though you're closer in, I'd say at least half of the attacks are still going to be coming at you from at range. I'd personally probably focus on ranged defense bonuses if that was what you were trying to do.
I agree with Frost. Ranged Defense. Arctic Air will take care of most of the melee foes. In general, I like to follow the melee fighters in, let them get the initial aggro, and then come right in behind them with AA. Melee Defense would not do me all that much good, but Ranged Defense is useful, especially for those foes who run outside of the AA cloud, then turn around and shoot at you.
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In playing an ice/kin and using arctic air would it be wise to focus on melee defense? Or should I focus on range defense still?