From the look of the Pics, that X looks like it was well kept...and with only 58,000 miles for a 2002...that's damn good...I have a '03 with 56,000...you did not mention if it was a 4x4 or not, and I could not really tell in the Pics...if it is, check out any Offroad damage, Body and Bottom of the X...If all goes well...JUST DO IT !!!
I had no problems whatsover with my '03 X...Nissan has a reputation for Great Reliabilty...you can't go wrong...