I have the same receiver, but went with the Polk TSi100. May have been a bit cheaper at the time but were also recommended with that receiver. I was looking for an old school style 2ch system which is hard to find new. What a great set up for my 40x23 garage. Sound and clarity are awesome.
I found 4x10 sheets for about $22 putting it at 55 cents a sq foot. With drywall it is 86 cent a sq ft.
Can I ask where you bought the material in Az? That is a really good price. I am putting it on my garage ceilings. Thanks!