Point him to this blog post on my website I kinda documented where I went this year in CO and where I want to go. I've been to 8 resorts here in CO but I've also heard a lot about the others. Where he should be looking depends on what the goals are for the trip - good skiing, nightlife, shopping, family atmosphere, non-ski activities, etc. If I had to plan a trip to ski here I would either go to Breck or Vail. Those two places have pretty complete packages in terms of terrain, amenities, etc.