unless you have a LOT of algae, the 4 crabs will be too much, IMO. 1 each should do it.
I suggest http://www.reefcleaners.org">www.reefcleaners.org</a> for the CuC, I was very pleased with my orders.
In addition to the snails listed, I would add a few Narrissus and Cerith snails.
Peppermint shrimp only if you have aptasia or know they will feed on prepared foods.