I went to Banff last year and it is a amazing place. A catered chalet can save you alot on going out and spending lots in resturants and if you can be flexiable with when you can go that helps to.
Lake louise is a little distance about 1 hour from memory but the skiing is great and the veiws are fantastic.
Sunshine village also has some of the best veiws and the skiing for me was the best. Norquay in Banff for me was a little boring but minutes away.
Do not forget other places like Breckenridge, Colorado. Been there 3 times and will go back, again a fantastic place to go to along with other ski resorts only a small bus journey away like Keystone.
Best of luck anyway.
Lake Louise
Banff