I want to say I paid around 16 for mine. I was looking at an LR4 in the 20k range but I picked the LR3 because of how good of shape it came in. Things I looked at were
Interior- Are there scuff marks from children, stains, cuts, and marks on the headliner? This will tell you if it was a soccer mom rig, which may not be a good thing without maintenance records
When I bought mine I made them put it on the rack after the test drive. I did this for several reasons, I wanted to check for leaks and see if there were any scrapes on the A-arms, frame and axels. This will tell you if it was ever taken off road.
On my rig I could tell that the front shocks had been replaced in 2012-13, Big white sticker.
As for lift, it helps while offroading because it gives you two extra inches in regular mode. in off road mode u are limited to 25 mph.