Less is more
x2 for agreeing with Alan and David! 
Less is generally more, and most of those items would rarely (if ever) get used.
I have a bullbar and snorkel, which mostly give me peace of mind. The snorkel has only been 'used' once (crossing Nolan's Brook on OTT at pretty high levels).
Bull bar has only been used to protect the vehicle from scrapes in the carpark - although I always feel better driving at night with the bull bar.
Also a fan of the Coopers - I have had at least 3 sets of the Zeon LTZ's (19") and love them. The only downside is the expense. So add them back onto your list if you want good tyres.
I'm currently 2/3 of the way through a set of Maxxis AT980's. Have been really impressed with them so far (and ~$100 ea cheaper than the Coopers).
Do a search on threads for tyres - there are so many comments and observations from forum members - it's worth reading up more detail rather than this thread becoming another 'tyre thread'.
As had been pointed out, you actually need very little above the standard discovery fitout, to head into the outback for extended periods.
A Gap IIDTool is a must - I would definitely put this at the top of your list...
As has been said, just get out there and enjoy the journey with the family (and spend less time/effort/$$'s on how the car is setup!)...
D4 3.0L SE, MY10, Arctic White
ARB Colour-coded bullbar, Safari Snorkel, Traxide DBS, LRBT1 BT audio module, trying out some 19" Maxxis Bravo 980A/T's (ex Cooper Zeon LTZ's)
ex D1 2.5L 300Tdi, MY97 - loved it, gone to a better place.
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