Don't forget to:
Have a coffee and cake at the Copley Bakery
Swim in the Montecollina Bore
Treat yourselves to a meal at the Blinman Hotel
Visit Brachina and Parachilna Gorges
If you turn off at Copley rather than Lyndhurst you will travel on the Mt Hopeless road to join up with the Strez just SW of Montecollina. A much more interesting road compared to the Strez which is basically the gasfield supply road and virtually at highway standard.
In fact if you are coming in from Sydney why not come through Broken Hill and then turn north at Yunta up the old mail road to Curnamona and Martins Well. After Martins Well you turn west to go through Brachina Gorge, up the highway to Parachilna and then through the Parachilna Gorge to Blinman. From Blinman there are a number of good and not-so-good dirt roads heading up to join the Copley-Arkaroola-Mt Hopeless road at Balcanoona.
When I worked on the Moomba-Adelaide pipeline back in the 80's the Yunta-Martins Well road was our emergency access when the main pipeline track north from Peterborough was impassable. If you like I can post up a set of GPS waypoints.
Be aware that if you take this dirt road option there is no fuel or other supplies between Yunta and Parachilna (300km) and between Blinman and Cameron Corner (500km).