buying an 80

No timing belts to change (its chain driven).
Standard servicing for a petrol motor - filters are relatively cheap.
Valve clearances are a shim adjustment - need to be checked every 40k if you're running on gas - 80k on ULP.
Big servicing costs are the wheel bearings (4 wheels), swivel hubs and diff/gear oil changes, so the big services do cost a lot, and take a lot of time.

Having owned a Petrol manual and now Turbo Diesel Auto I would agree with other feedback.
Tojo parts even non genuine are expensive but hopefully not often required.
It is critical to find a mechanic who knows how to tension wheel bearings. We are in the tribunal next fortnight after a mechanic ruined our front hubs (and nearly our lives) after less than 10,000 kilometres! Insist on new locking tabs being fitted each time they are dismantled. Supply your own and ask to see the old ones.
Our lengthy experience in extreme four wheel driving (most recently in the Vic high country with day time temps above 40 degrees) suggests 80 series outlast and out perform newer models of Nissan and even 100 series petrol.