I use the 100% isolated soy protein powder that I buy in bulk at the grocery store. It has a very strong flavor that is an acquired taste but I love it.
I use it in a smoothie made with 1/4 cup blueberries, 1/4 blackberries, 5 strawberries, 1/2 cup soy milk, 1/2 cup orange juice, and 1 scoop...