Hi Bryan and welcome to the Club,
There have been many good comments on what to look for, and my experience is looking for as late a model as you can afford and if you can get one from a reputable dealer it will usually have a warranty, and an owners handbook and service history.
The two diesels have been mentioned - both good engines - but if a 2.5 V6 petrol comes along you should consider that too. The All wheel drive is fantastic, and I got over 35 mpg on a long run driven steadily.
The two diesels are often used for towing, and you can tell what sort of towing they have had to do by looking at the wear on the tow bar.
The one you want is out there.
Good Luck
Peter.