If I were you, I'd roll the dice for Zapdos one last time. Yes, it's outclassed by Raikou but is still #2 in electric-type rankings, and doesn't have a Mamoswine on the way in the coming months, for instance, as Articuno does.
Put another way, Articuno doesn't really stand out in the grand scheme of ice-type offense in the same way that Zapdos stands out (and will continue to stand out for some time) in electric-type offense.