I'd also consider fitting a locally available engine, if you are going to be using it a lot. I'm very happy with my tdi200, but, being based in the UK I know I can get parts in 24 hours.
If I was in, say, Australia, I'd be thinking of a Holden engine, again, parts availability. South Africa, maybe BMW?
But if you ARE committed to the tdi200 - and I understand that this does make sense on a number of levels - I'd really think about getting one that's been reconditioned. Expensive, I know, but you've got a lot of reliability built in, and the hassle of buying unseen, you could end up buying 3 before you get a good one, remember it's over 2 decades since the engine was first produced, there aren't many that haven't done starship miles.