While I think it was probably a bit of crass marketing that put Storm on the Marvel Adventures: Avengers team, I think, in the regular Marvel Universe, that Storm would work really well as a member of the Avengers. So I'd make her an Avenger.
Think about it - she's already famous enough, popularity-wise, and story-wise, I think she MAY have reached the end of her rope in the X-Men, especially with her marriage to the Black Panther. She might actually need that center stage that being an Avenger gives her.
That's it for the I'ds of March! I hope you had fun! I'd hope you'll be back next year!