I especially agree with holding precious metals in your home, and guns/ammo.
It is easy to have a small safe for some coins/bars no matter where you live, and a pistol or two. You don't have to have massive amounts of either, but holding a percent of your wealth physically in a solid asset in your house and being able to defend your family and possessions gives one a sense of calm and control.
Food and water/filters as well, survival skills and tools are also important. You don't have to go crazy on the prepping, but it doesn't hurt to know how to keep yourself alive in case of an emergency.
RE: What hard assets would you choose to buy?