If you really want to get into Colorado off-roading, you'd be happier driving Xterra...(if you wanted to stick w/ Nissan family). You'd have a lot more options to modify Xterra than Pathfinder...to more off-road worthy.
If you're somehow capable of staying on newbie trails only (I couldn't), then pathfinder will do...
http://www.amazon.com/s/ref=nb_sb_noss? ... o+off+road
You might actually want to buy one of those books before buying pathfinder, and see what easy/moderate/hard trails require. And, decide if pathfinder still suits your needs.