As I add a few companies this week to the defensive value investing portfolio that I manage for the Fool, the theme of this specific purchase could be "invest with the best." Of course, I'm talking about Berkshire Hathaway (BRK.B -1.38%), which to me perfectly embodies the conservative, outstanding companies I prefer to own. With a management team deserving of a place on the Mt. Rushmore of investing (if such a thing existed), I'm more than comfortable that the company will be run with shareholders' best interests at heart. And perhaps even more exciting, Berkshire's business operations should steadily improve with the overall economy. All in all, I love Berkshire's combination of rock-solid safety and potential business tailwinds, which I explain in greater detail in the video below.