I'm not going into Organic and non-Organic discussion other than to say that unless you know the farm you are getting the foods from and have been there, you never really know for sure! It is so bad that I have seen terms show-up like: Certified Organic! But in all honesty, unless you know that group, it remains the same issue. With the big players in the market having full control over the major growers of Organic foods, that leaves the little guys and their ability to meet the requirements of their local customers.
At this point in your life, the savings is worth the risk, if any exist! We cook potatoes whether sweet or white.
The high costs, high taxes and high tech farming has really cut into over-use of bug killers and growth products to a minimum compared to the past when they had been dumping the stuff on the plants.
Now, there should be a bunch of people jumping in on the dangers of drugging plants. That all said, the information base used are all prior to the current application methods and what is being used. The last twenty years has seen major changes in Farming and the last ten years that change is huge!