If side impact safety is a priority: Seat mounted side air bags with side curtain airbags were an option on the 2007s and came standard starting in 2008.
ATrac (active traction control) and (as mentioned) a locking rear differential are important if you are going off roading. They came as part of the Upgrade package #1 and #2 if you were getting a 4x4.
The locking rear diff. was also a stand alone option.