Why not restore the petrol it would be more original, you could always fit a lpg kit to get cheaper running costs for when gas is available. Your main issues with the petrol are running costs and getting the dizzy wet with deep wading. I am sure you could water proof the dizzy some how with a rubber glove or something, but for economy you wont beat the 200tdi. It really depends if you want to keep every thing original, if it was me I would go the 200tdi, but that is just me being stingy re running costs :)
Chris

