Replying to Planning a Trip for Spring Break

Ok, here's the deal. I live in PIttsburgh, and I'm planning a ski trip for my spring break, March 7 - 11 or 12, 2009. I'm trying to find a way to get to Whistler without spending a fortune. Airfare to Vancouver is around $500, but airfare to Seattle is only like $250. My idea is this: fly into Seattle, take a bus/train to Vancouver, and take a bus/shuttle from Vancouver to Whistler. Has anyone tried this or tried this before? Or does anyone have any better recommendations? Thanks for the help.