For anyone wanting to experiment with potassium intake - you can include juices. Ones you make yourself with organic veg. It's what I'm going to do. They also give you a range of extra nutrients and help with detox.
I've been taking various green and reds drinks recently, most aren't that high in potassium (maybe 100-150 mg). I guess it depends on which fruits and vegetables you're using. Many are quite high in potassium. V8 has 400-500 mg potassium in 8 oz (low sodium V8 has even more because they add potassium chloride to compensate for less salt). V8 isn't organic, but I mix Field of Greens and Nutrex spirulina with it and those are both organic.
This site has nutrient lists of vitamin and mineral for many different foods. You can view the list either alphabetically or in order of highest to lowest.
http://www.nal.usda.gov/fnic/foodcomp/Data/SR18/nutrlist/sr18list.html
This site also has lists, but everything in the list is the same weight unlike the first list.
http://nutritiondata.self.com/tools/nutrient-search
Another feature of this site that I find more useful is that you can search for individual foods and get a complete profile including vitamins, minerals, fat, protein, carbs, sugar, fiber, omega 3, omega 6, and choline. There's a feature where you can adjust the weight such as 1 oz (28 g), 100 g, 1 cup (weight will vary from item to item).