O.K., some high-powered advice. According to this slide one of Goldman Sachs's "best trade ideas" has returned, since December 7, 2009, 18%.
Impressive, no? No. According to Yahoo the S&P500 closed on December 7, 2009 at 1110.72. The return on the index from then until March 30, 2012--inferred from the statement on the slide giving the current value of the S&P as 1408--was 26.8%.
If you pay me a whole bunch of money, I'd be willing to try to underperform the S&P by about 4 percentage points a year.