Organic - too expensive?

It is a common knowledge, that organic food is better than conventional one. However, it is more expensive as well. But according to the article, that you can find below, some fruits and vegetables are more prone to contain the highest amounts of dangerous pesticides. These are (in 2011):

• Apples
• Celery
• Strawberries
• Peaches
• Spinach
• Nectarines — imported
• Grapes — imported
• Sweet Bell Peppers
• Potatoes
• Blueberries — domestic
• Lettuce
• Kale/Collard Greens

So buy them organic, whenever possible. The following fruits are safe to purchase in conventional versions:

• Onions
• Sweet Corn
• Pineapples
• Avocado
• Asparagus
• Sweet Peas
• Mangoes
• Eggplant
• Cantaloupe — domestic
• Kiwi
• Cabbage
• Watermelon
• Sweet Potatoes
• Grapefruit 
• Mushrooms

The source:  http://www.takepart.com/news/2011/06/14/apples-top-the-dirty-dozen-list-of-most-pesticide-contaminated-produce