you are getting so fucking screwed man.
If you want to save your money then go to www.translink.bc.ca find a bus route from the airport to the vancouver hotel downtown vancouver. ( you can probabl just type both of those locations into the trip finder and it will tell you the rest) this trip will cost you like 3.50 or something.
Next buy a ticket for the greyhound at the vancouver hotel, if you catch the express it will not stop at a bunch of lame places and it will take you straight to whistler, should cost about $20 $16 if you have a student card.
The bus from the airport to downtown will take about 1hr 15 mins, the greyhound to whistler will take 2-4 hours depending on which bus you catch and how retarded the driver is.
In my opinion your best option would be to tell us when you are coming and I am sure someone here will hook you up with a car ride for somewhere between $20 or as low as $5. You would likely still have to bus to downtown vancouver but a car ride would be much better than any bus ride.
So, when are you coming into town?