This column was originally published on RealMoney on March 9 at 10:29 a.m. EST. It's being republished as a bonus for TheStreet.com readers.When asked why he robbed banks, Willie Sutton replied, "Because that's where the money is." It's still there, and the guru strategies that I use have led me to believe that three financial institutions in particular are bound to get quite a bit more. According to U.S. Banker, the first three quarters of 2005 were the most profitable in American banking history, with record earnings of $102 billion. Some observers think 2006 won't be as heady, but it still should be a good year. Americans are certainly showing no signs of reining in their spending. The personal saving rate -- the proportion of money Americans save -- has not been above zero since March 2005, reports the U.S. Commerce Department. One of the three financial institutions that have caught the attention of my guru strategies is the world's largest, Citigroup ( C). My strategy based on Peter Lynch's investment style singles out this financial services giant, in part because its yield-adjusted P/E/G ratio (P/E ratio relative to growth) is a healthy 0.77, well underneath the 1.0 minimum. Another plus is that Citi's equity amounts to 8% of assets, nicely above the 5% minimum required by this strategy. Citi's return on assets (a measure of profitability) of 1.37% also exceeds the strategy's minimum of 1%.