Assuming you want a big base then South Kootenays WW etc are not it.
Rogers Pass and Revelstoke area are it.
Farther north - Smithers, Terrace area are it.
what lee sez ,if you got no money revy is relatively cheap both to get to and to stay at once you are there AND if you have the ability to tour you can save $$ on lift tickets by touring in rogers pass.
quality wise I would rate revy a cut above any ski area I have skied in BC and touring in the pass is fantastic … you can hit some great lines walking out the back of the p-lot at the glacier park lodge .
I just got back from a medical confrence /banff/rogers pass trip and it would hve been nice to tack on a few days at revy but we ran out of time
smithers [HTML_REMOVED] terrace is a long fucking way from everywhere to get to and really they are just small local hills with a chair and a T ALTHO you COULD get away without a car in smithers if you flew in