Chuck / Heather,
Did that itinerary on the Mercury this past March, it is fabulous. We opted for the Celebrity tour, which was more expensive than that quoted for you.
You may want to get to the airport earlier than that however, flying out of Santiago, EVERY piece of luggage was unpacked/checked before you were allowed to proceed to the check-in counter. Lines were VERY long to say the least. We were on United, which when we got there was one of the smaller lines, but American's line was almost the length of the airport. The guards were however very efficient, but do not lock your luggage as (at least then) you will have to unlock it again.