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H.I. Yellow us the way to go because orange gets annoying from experience but yellow is fine and it's not to bad in the day either. I'd go with yellow especially if you ski with a lit if lights during the night.
HI Yellow and Ruby Clear and both excellent for extremely overcast days and night riding. The finish on the lens helps illuminate the texture of the snow, making it easier to pick out ruts and bumps while you're skiing. The Pink Iridium is also great but I'm sure you aren't looking for a pink colored lens, ha. I use the ruby clear lens for my A-Frames at night and absolutely love them.