Is there much of a difference between the Northwind Windsock decoys and the Northwind Windsock Economy decoys? I know the economy decoys are not painted (they are just white). They seem to be much cheaper though. I only have 24 shells right now as I am just getting into snow goose hunting. Should I buy the economy to get a larger spread or go with better quality and buy less of the regular northwinds? Also, are heads important or should I just get a head for every 10? What is a good ratio? Thanks.