Better Buy?

Hi guys, I'm looking at two Xterras and am trying to determine which would be the better purchase. I'm currently looking at a 2001 SE that has 122k miles and is listed at $3999 and a 2006 OR with 154k miles listed for $6995. I'm wondering if it is a true OR, it does have the rear diff lock, but no VDC switch or any offroad badging on the sides. I'm leaning towards the 2006 simply because it's a newer vehicle and the engine has more power, but the low mileage of the 2001 is very tempting. I've been researching the common issues to look for, but I guess my question is which vehicle do you guys think would be the better buy for reliability, price etc? The 2001 has a pretty good carfax with what looks to me to have a pretty decent maintenance history (a lot of vehicles I've looked at have hardly had any info). The 2006 has quite a bit of service history as well, but a lot of it was emissions inspections (it was a Pennsylvania vehicle). Thanks is advance!

If I posted this in the wrong area please feel free to delete or move, I wasn't sure.