What kind of skiing are you looking for? What will you be studying?
No matter where you go, staying in your car will have its challenges, specifically in the in the cold.
Sun Peaks when compared to other resorts in BC is fairly modest, but will still be bigger than most places in Ontario. The park is decent, fairly run of the mill. Looking back to my first year of uni there is no way I could have travelled 4 hours on regular basis to ski. So having it has a local hill for day trips is a bonus.
I have yet to ski Revelstoke, but from my understanding it trumps Whistler in terms of snow quality, terrain and lack of crowds.
Whistler is awesome, but fucking crowded on powder days and holidays. It takes at least a season to know the place well, unless you know some people that like to share. Overall, park & skiing it will meet all your needs. But it is quite the journey from Kamloops. You will pay off your pass no doubt, but it will be quality not quantity.