WANTED Station vagon or 4x4 for travelling 2 adults and 2 small kids in COLOMBIA

We will start our trip in July 2014 in Colombia. We are a couple with 2 small children under 5. Looking for a car in good mechanical condition to travel for 6 months from Colombia  to Ushuaia. We want a 4x4 or a Station wagon, but we are totally open for other suggestions.

thanks