Gold is worthless when SHTF. Why would I want your gold? Commodities will have intrinsic value. Ammo, food, water, tools, gasoline, parts, steel, things that have a true use beside hanging down in-between a nice set of tits and being shiny.
Gold is worth the price the market is willing to pay for it. Diamonds are another good example of an item worth an artificial price dictated by DeBeers.
But I digress. I am not a gold investor. It is another commodity like soybeans, pig stomachs, etc. And to invest in any commodity means you best understand what you are buying VERY WELL. The price of gold is not directly tied to the dollar and thus the price of gold is not directly inverse to the value of the dollar even though there is a strong relationship. There are a great number of factors that affect the price of gold: supply/demand, inflation, international markets, etc.
Don't buy because the price is going up. That is always the point where you buy and then watch it stop moving or go down. Buy it because you understand how it can diversify your investments (if you know that it can).
I believe in the US economy long-term. That puts my eggs in the stock market with diversificaition in bonds and real estate.