Two years ago I bought a 2005 100 Series GXL with the 4.7 litre V8 petrol engine for $29,000. I was immaculate, with full service history and had some off road fruit bolted on, but no real evidence of off road use. At the time, a similar vehicle with a 4.2 turbo diesel would have cost around $20,000 more. I think it's because the silver nomads are driving up the prices on good second hand diesel tows.
Anyhow, I did the sums before I bought the V8 petrol and found that, with service costs, fuel and so on, it would take me 200,000 km to break even against a 4.2 turbo diesel. I didn't factor in resale costs. The V8 petrol is great, but thirsty. If you look at the mileage you're going to be doing, how long you plan to keep it and relative costs, the numbers should tell you which way to go.
Down the track, I'll go with a diesel for the longer range, ease of carrying extra fuel, and better economy while towing. But, right now, the petrol engine is just fine. Dollar for dollar, I think choosing petrol will give you more car for your money.
But in their heart of hearts, I think every 4WD petrol head would prefer an oil burner. I know I would.