Considering my thinking and opinion, I will never use any low leverage than 1:100. If I can, even I will just always take as high as possible leverage available. With low leverage, we will have easy way to get margin call since we know that high leverage produce high margin, vice versa. I can not imagine, if I use about 1:5 leverage to trade gold, than how much capital should I use to make my account safe from margin call.