We made our decision to book with Key to the Rockies because they had a great selection of properties at very reasonable prices. The bulk of the properties were within walking distances to the slopes. The property that we selected, Liftside Lodge had great views of the ski slopes, the condominium was very large (appr. 800 sq. ft. for a one bdrm!) and the indoor pool was a real hit with kids.
The staff at Key to the Rockies was very helpful and not only helped us with booking the condo but they also helped us with all of our other needs (lift tickets at Arapahoe Basin, tips to beat the crowds, restaurant recommondations,ect). Through our lodging research we learned that Key to the Rockies was one of the few companies that will actually book a specific unit for you (other companies only reserve the size of unit and then you don't know which actual lodge you get until you actually check-in). I book with them alot as they have a great repeat discount offer to their return guests, plus you know exactly what you are getting!