I have owned LR3s with both the 4.2 (early 05 model) 4.4 engine and an 08 RRS/SC with the 4.2 SC engine. I like the 4.2 engine in a Supercharged model - stronger. Which years -- price matters, but the very most important piece is the repair and service record that can be provided. Go with the one with the best record of critical parts being replaced recently and newness of tires, battery, et al. One of these where an anal owner has replaced all tranny and axle lubricants would be a winner in my book.
It would also be useful to know where you live: and where the car was last garaged (Florida and Southern California cars, not confronting Winter, would be better than a snow shoe in Illinois or a bumper car from NYC, wouldn't you think?).
It would also be useful to know where you live: and where the car was last garaged (Florida and Southern California cars, not confronting Winter, would be better than a snow shoe in Illinois or a bumper car from NYC, wouldn't you think?).