VK3GJM,
When ordering my vehicle the e-diff was a priority. By the way I chose Stornaway Grey with ebony and have been quite pleased with the combination. It is the first black leather that I have owned. I have mainly had European cars in the past that have had grey to tan upholstery, my old Falcon ute and my wife's Renault Laguna both have grey.
I have added a number of the accessories that you have mentioned and like you my preference was the Safari snorkel as it is robust and sealed to the air box. Be aware that you will experience a slight, and I mean slight, amount of noise on spool up of the turbo with a snorkel fitted.
I chose the Opposite Lock bull bar and had it color coded to suit the vehicle. Instead of the full rear bar I chose an Outback Accessories rear wheel carrier from OL and once again had it color coded. It is very strong, looks good, very easy to operate, saves heaps of weight and a HF antenna and work light can be fitted to it if you wish. Being color coded I think that the bull bar and the RWC look as though they are part of the vehicle and 'set it off'.
It sounds as though you are setting your vehicle up for some remote travel and as you will be relocating the spare tyre to the rear of your vehicle have you considered an auxiliary fuel tank? It is a good addition if you are traveling to remote areas or long distances or towing. I know that some people do see the value in them but I am quite pleased with mine.
As others have stated and whatever accessories you choose you will be pleased with the D4 when arrives.
Lou...
