Lance,
If you're considering Yerecoin you could also look at New Norcia, Mogumber and Wongan Hills as areas to explore. They're all in the northern wheat belt around 150km NE of Perth. I've never been to Yerecoin exactly but have been around the area and I can assure you that light pollution will not be a problem for many years to come. Most of the farmers would tell you that clouds shouldn't be a problem either based on the last couple of years, poor buggers.
Hope this helps a little.
Travis
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