DSB all the way. There are not benifits to the Crushed Coral. I wish I were as close to a place to get South Down as you are. I just mail ordered 200 pounds of sand for $125 including shipping from
http://www.purearagonite.com/ . It was shipped from the east coast to Washington state. Sounds like a better deal then 20 pounds for $25. You could probably mail order for less than me.
Al