Which clubs do you ski at, and what parts of TC do you like to ski?
We have been to Canada three times and the US once to ski, but have gone earlier, so can't comment on conditions, except to say that what North American's describe as sketchy or woeful is not the same level as sketchy or woeful here.
In terms of flights Vancouver, LA, San Francisco all have good connections to ski regions and there are some bonuses, such as going to Hayden (we are going to Steamboat this year) costs us only $10 more than flying to Denver then shuttle to Steamboat because apparently some of the regional airports count as the same sector as Denver - so check with your travel agent when booking if you choose somewhere like Colorado.
We've been to Lake Louise twice and it sounds like a good bet for the time of year you are going. We've been in a low snow year and there was still heaps more options than what you get here. Lake Louise also has a nice mix of trees and open steeps.
Both times we based ourselves at Lake Louise (the village not the Chateau). LL Village is physically about the size of Arthurs Pass, (but there are multiple hotels and hostels instead of baches), a good size supermarket, bottle store, ski /sports shop. Lake Louise is five minutes away and our passes covered Sunshine and Nakiska so we jumped on the free bus to sunshine one day). You can also catch the Kicking Horse Powder Express (about $90 for bus and lift pass) and had a day at KH (highly recommended).
We have flown both Hawaii Calgary and Vancouver Calgary, both were good options, (although the Calgary - Hawaii leg was on Air Canada whose plane wasn't as modern as AirNZ) and got a shuttle up to Lake Louise - we have found that we didn't need a car and it was more cost effective to do without.
If you go with the LL option take a mastercard, the ATM's at LL didn't like our visas so we had to go into Banff to get cash. Personally I found the bit of Banff I went to like Queenstown or Riccarton Road, so if you want nightlife and shopping Banff is a better bet.
We've been other places, but if you want to do more than one field from a single base then LL is hard to beat.