It's a great question, but when you look for info, different sources list different "Top 10's." But the following seem to be the ones that commonly come up in some way or another:
Kiwi, Guava, Watermelon, Cantaloupe, Blueberry, Banana, Tomatoes, Papaya, Apricots, Sweet Red Pepper, Avocado, Mango
Also, they are good for different things and have different healing properties and nutrient combinations, and so it is important to get a fairly broad range of fruits in your diet. It is also more beneficial nutrient-wise and healthier for your body to eat organic as much as possible.