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lots of good questions, I will try to answer all of them except the one about prices cause the Australian market is unknown to me.

An XTX/XTR would cruise happily on the motorway at 85mph or more that's about 137Km/h

The XTR would be the wiser choice if you wish to do some dirt / rocks etc. The XTX is the king of the twisty roads with its agility and cornering speed it's unbeatable in that class. The XTR off road potential increases with the choice of tyres you get, the more knobblier the better they handle the rough but you sacrifice your cruising on tarmac comfort and if used on tarmac they wear out quicker.

The engines on these bikes need to be kept topped up with oil, clean oil filters (not as often as a KTM mind you) and as long you check your levels they will last you a very long time. We have some forum members who have run them into the 150'000 km and they are still going, thanks to their good service and maintenance.

An XTXR like the one you've found with 5000km on the clock is still a fresh bike so provided that its in good conditions and the price is fair then I'd give it a second look if I were you.

Good luck with whatever you choose and enjoy your newly found passion and forum.