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So what's the budget..
You can go a early model 4.2 or much newer 3L. Late 07 CRD are the pick for reliability.. a few little mods like egr block, catch can and boost control will see the 3L very...

$20k should see you in a early 4.2TD with a few mods.
I would change the very small AUX tank to the larger 75ltr
ones that are available, cause to me it just makes sense
if you want to tour

FWIW, I would suggest that you buy the car you most like to drive on a daily basis. Any 4wd will manage the trip you are talking about with ease.

I chose the 4.2 because I wanted a vehicle which...

Big price difference between a 3L and a 4.2.
Having had a 3l and now a 4.2. I will say the 3l is easier to drive around the suburbs. But trust was something that always sat in the back of my mind...