most things been covered;

I would only buy one with a good history most owners really look after them well (go to MLR for sale section)

Check

start from cold noisy lash adjusters (sounds like noisy tappetS)
clonks and knocks on full lock (try some 3 point turns) = could be diff bolts, ARB bushes/drop links/top mounts etc
difficult to get first or reverse = clutch problems and is a real pain to do a clutch on these
check for noise off the front when you lift on and off the throttle, like a diff whine = transfer box which again, pain in the neck job and tricky to find a decent 2nd hand one.

great cars just make sure you buy a good one.