Travelling from Glendambo to Ceduna: weighing the options

The current version of my highly tentative 2014 itinerary requires me to get from Coober Pedy to the Eyre highway (and ultimately to Maralinga). Studying the map, I see there are a number of options for this, other than driving all the way around on the sealed highways via Port Augusta.

The Googs Track seems like the most direct and obvious choice. But I see it's also possible to turn south at Kingoonya and follow that track to Wirrulla. I'm wondering which is a better choice for me?

This thread: http://www.exploroz.com/Forum/Topic/91055/Glendambo_to_Wirrulla.aspx seems to say the road down from Kingoonya may be easier than the Googs Track. Judging by that thread (and other information), Googs involves a lot of dune driving. The other track may be corrugated in places, but doesn't offer up other challenges such as dunes (assuming, of course, it's dry). In fact it appears somebody drove it in a sedan!?

I see I could also go southeast and down to the Gawler Ranges NP. However, after visiting Maralinga, I plan to travel east via the Eyre highway to Port Augusta. Along the way, I would have the opportunity to visit the NP (and possibly the adjoining CP).