The Washington Post recently reported on Consumer Reports' Food Safety and Sustainability Center consideration of whether organic foods are worth the extra money.
For fruits and vegetables, they concluded that the priority to use organic is "high" to avoid pesticide residue. They labeled beef and dairy "medium to high" priority for nutritional benefits (limited antibiotic use, more heart healthy Omega-3 fatty acids especially with grass fed animals). They also labeled poultry "medium to high" priority to avoid the antibiotics in regular chickens as well because organic chickens can not be fed what is called "poultry litter" which is a mix of chicken droppings, spilled feed and feathers.
Food for thought.