[OzRick25]

I would wait or go the patrol. A lot of people opt for diesel because of fuel economy but to make that stack you need to do the km so there's not likely going to be too many low km ones about. If you go the Patrol you will use more fuel than a petrol JK and diesel is not really cheaper anymore, the 3l patrol's we used at work averaged about 16l per 100 km carrying about 500kg. My petrol JK gets 14.5 per 100 carrying about 300kg and towing 1200kg.

I don't think there is a huge difference offroad, it's just personal preference. Both the auto and diesel came under cooled so that would be a modification priority unless you like monitoring temps like a hawk and resting the vehicle often when offroad (they have this issue with a few patrol models too).