Buying an AU

[Longreach]

Well basicly i'm considering buying an AU Sedan, roughly 6 or 7 years old, like 1999 or 2000 i guess.
Wondering what i'd be looking at having to pay:
Would prefer:
Transmission- Manual
Engine - 5L

What sort of lifespan (kays) do the engines get, like is there a point at which you should go nope don't even consider it theres to may km's.
Anyothere things to watch for??

Cheers for any info i get guys , and girls.