Crown is the distance between the legs.
For lattice 1/4" crown galvanized staples are most commonly used.
Tool King has a good buy on a PC reconditioned Narrow Crown Stapler for $40.
http://www.toolking.com/products/4200320.aspx?googlebase=NS100AR
This model from PC is limited to 1" max length staples, which should be fine for your application. I would grab this deal if I did not already have the next bigger model.
http://www.westerntool.com/product.htm?pid=422622
You can buy SS Gun Staples but they are hard to find and very expensive. Note on this link that Senco says use Stainless for ACQ, but you should be fine with galvanized on Western Red Cedar.
http://www.dhcsupplies.com/store/p/...lvanized-Staples-1-2-1-1-2-.html?feed=froogle
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