Many private buyers get into precious metals as a way to guard against their money losing value in the long run. They usually start with silver, especially if they are younger or do not have large sums of disposable income. A question we often hear from these people is "When should I move from silver into gold?"
Al Doyle answers this question in his recent column for CoinWeek: "Making the Transition from Silver to Gold." I think he covers the bases pretty well, and I think his answer is probably the best one I've heard on the subject.