I assume your buying brand new if it is an 07' so your big choices are X S Off-Road or SE model. Lots of threads on that so read the top one that is stuck there. The only issue people seem to have are with transfer cases for people that really go out and thrash off road. I have a S model (which was base in 05') and I had one issue but Nissan fixed under warranty.

You will like the 07' alot more than the 01' so much more power, room etc.