I spend a few days on the hill every year, I wear a smartwool midweight base layer top and bottom, Gore tex Shell pants, and a gore tex Jacket. I have one with light insulation for the cold days, and one with no insulation for the warmer days. Sometimes I wear a dryride hoody underneath if it is really chilly. If you spend a lot of time on the hill, I'd go with gore tex if you can afford it. There are many times that you will be thankful for it.
I love Smith's sensor mirror lenses for our weather. I either use the red, or blue sensor mirror almost exclusively.