Personal opinion is the LR3 is one of the best trucks LR has ever made in terms of reliability/functionality. Coupled with the reality that depreciation based off LR's stellar reputation saw these things plummet, you end up getting a lot of truck for your $. A whole lot of truck.
They are, however, still Rovers and like any Rover they require attention in the form of $, time, or both. The D3 in particular likes to consume brakes, tires, and bushings. Given how heavy it is this isn't surprising.
There is always the comment that the 08-09 is better b/c 'the bugs were worked out' or what have you; in practice, there are few differences that are really worth noting. The instrument cluster display is difference, but that can be rectified with an IID tool (which you should get regardless of MY you purchase).
With any truck service records are key. In particular, depending on mileage, you'll want to see a few things:
-Dif fluids changed.
-Transmission serviced
-EAS compressor rebuilt or upgraded to the AMK
-Lower Control Arms replaced
I would note the link you posted is illustrative of when many owners get out of their trucks, i.e. a few years ago when I grabbed my 06 it was right at 80k. Shortly after getting her I had the opportunity to replace the lower windshield cowl b/c water was coming in. About a year later the compressor died (call it the 9 year/100k mark). I opted to go with coils, there is a thread here as to why it made sense in my context. If you get an 08/09 and these things haven't happend, they will-plan on it.
A strong argument could be made for you to save $5k and get an 06-07 that is at 120k miles and has already experienced those problems-but that's just my logic speaking and may not be how you want to go after it.
I'd also suggest looking for one that has the features you want from the get-go; adding things on after the fact is a bit of a PITA (i.e. the bulk of NAS trucks have the HK stereo system which is decent but if your truck doesn't come with bluetooth, ipod integration adding it after the fact can be a pain in the ass). Get the HID package & cold wx packages. Look for a truck with 18" wheels.
Overall I'd suggest driving one; I love my D1 but the 3 is a totally different world in terms of DD which goes back to my comment about how you get a lot of vehicle for your money, it probably is one of the best kept secrets in the used car market. The drivetrain is superb and, get this, doesn't leak!
I'm sure there is a lot more people will add to the discussion but I don't think you are off base going from an Xterra to an LR3. Where within MY's you fall...that's up to you.
r-
Ray