I try to eat organic foods as much as possilbe, but that is not always possible. I do try to stick to eating organic when foods are high in pesticides.
I found a wallet guide online to help you when you are shopping. It lists the 12 fruits and vegetables most and least contaminated with pesticides. If you stick to this, it is a great start! Here is the link: http://www.ewg.org/sites/foodnews/pdf/walletguide.pdf.