Personally I'd keep it simple.
- Exended drawbar so you can fit a toolbox or bikes on the front. The extension is 300mm.
- Light on opposite side to door.
- Drifter control panel.
- Full oven if you like your food
- 150L Fridge.
Do these yourself afterwards
- Solar power/panels and regulator.
- External shower (this takes up precious cupboard space. Can easily put plumbing under the van).
- Extra power points / 12 volt sockets. (Jayco will either forget or put in the wrong spot, better to use van first and add where you need them).
- Speakers / radio. You can purchase a separate bluetooth dock/speaker which will sound ten times better for a fraction of the cost.
Get the Outback if size and weight and funds allow. If you have height restrictions you can have hatches deleted from the roof. Also delete the solar provision. Mine has a 'clean' roof so it can get under the carport, have about a 10mm gap.