Replying to Cheap Ski Trip?

Okay so I'm from Ontario, never skied anywhere good before and I want to go somewhere with good skiing (preferably powder with some park,) for a week long trip either on spring break or winter break next year. I'll be taking a greyhound bus wherever I'm going b/c I don't have a car and flying is to expensive. I have a budget of $700 for all costs of the trip. I would prefer to go west, but I will go east if it is worth it.

So NS any ideas on where I should go for a cheap but still good trip?