I like the ability and functions of the Select Trac, however this maybe a difficult find due to the number of Liberty that have this option.
At the risk of getting flamed here, I would look for a 2009 or newer. It just looks to me that a number of post associated with problems are from the first year release of the KK model (2008).
If you are looking at a cash purchase I understand the budget limitations. If you are going to finance the vehicle, you may want to explore purchasing new and compare payments of new vs pre-owned. While most used Liberty have lived most of their life as a mall cruiser/soccer mom/grocery getter, you never know if proper maintance has be kept up with as it should have been. New offers a warranty, used may leave you on your own. Or if buying used from a dealer, have an extended warranty thrown to the deal.
"If you have a difficult job to do....Give it to a lazy man....He'll find the easy way to do it."