Feb in banff can be hit or miss (lake louise, sunshine, nakiska, ect). If you guys have a car it won't be a big deal because you can just watch the snow reports and not go that far east if you don't want to.
If you are looking for some park when you are here, louise is pretty good (not as good as wistler im sure). I haven't been to castle mountain (45min east of fernie) but i think they might have a pretty good park. i am planning on doing some riding there next year.
Mountains that i would not make an effort to go to unless then have a big dump are, Nakiska, Kimberly, and Panorama. In fairness i have only been to nakiska of those 3 however i have never hear good things about kimberly and pano.
I have been to Red Mountain and it was a great time and a cool place like snow wolf said. I have not been to whitewater yet but i hear great things.