Unshaven and anonymous
Ben, the unstated premise in your argument is that God's end is always His maximal glorification. The problem is that "glorify" is used in multiple ways. In one sense it means "to manifest His glory". If you maintain that this is always God's end, then God was obligated to create, which is contrary to Reformed theology, because His glory couldn't be manifested unless there was someone to manifest it to. That's why I'd rather stick with what Dennis said, and not attempt to figure out the background to God's volition - because that no cause can be assigned for the will of God is pretty standard Christian doctrine.