"Besides durability, what should I look for?"
I look for how long the brass stays malleable. Also, the uniformity of thickness of the brass. Those are a couple of things I look at...
"Keenan I dont mean to sound like a smart $#@ but if your not sure what else you need to look for than why the concern for the ultimate brass?"
Who cares? If that's what he wants, by all means give him the information and let Keenan decide...