To date there have been no studies that show conclusively that organic food is better for our health. As a matter of fact, most of the studies that have been done that point out the health benefits of vegetables and fruits have used conventionally grown produce.
If you are concerned about consuming pesticide residues, keep in mind the Environmental Working Groups Dirty Dozen and Clean 15. The list can help you to choose which produce you would like to buy in the organic department of your grocery store, and when you could choose conventionally grown vegetables and fruits. 2011EWGPesticideGuide