The Environmental Working Group has released a sneak peak at their updated "Dirty Dozen." These are the fruits and veggies you need to prioritize buying organic because the pesticide content you ingest is the worst if you buy conventional. Of the clean list, you can buy conventional and not worry about your health.
If you're watching your budget while shopping for organic produce, a great strategy is to go to the Farmer's Market 1 hour before closing to get great deals. For example, if you know the market closes at 2pm, go at 1:15pm and you'll start hearing "one dollar/pound specials." You might not get everything on your list because the selections might be slimmer, but if you're looking for apples, there should be plenty of apples to choose from.
Here's more with shopping tips on where I find my organic produce in L.A.
Can't download easily? Here's the Dirty Dozen list to prioritize organic: celery, peaches, strawberries, apples, blueberries, nectarines, bell peppers, spinach, cherries, kale/collard greens, potatoes, grapes (imported).