Have you thought about investing in silver?
Standard portfolio theory at least suggests that you should think about it for the secret is to make sure that your investments are diversified across different sources of risk. I don't mean investing in futures or options, no, not at all, rather, making sure that as a part of a well balanced portfolio you have an amount of physical precious metals stocked away for a rainy day.
We should have stocks in our investments, for they've provided the best growth over the decades. We want to make sure that we have some high risk and some low of those as well. We should also look at various types of bonds. Perhaps corporates, with slightly higher returns, or Treasuries with greater security, or municipals with their tax benefits.
But our classical theory about how to allocate your investments also says that you want something to guard against inflation, that's what the precious metals do.
Might be worth contacting Monex Deposit Company through the link above to see what they can do for you. They supply both bullion and coins and so can help you into this market with whatever level of investment you want to make.