The chalky protein powder taste is mitigated by the fruit and peanut butter. I try to consume roughly 200g of protein a day, so I need a bit more than nuts will give me. I'm by no means a bodybuilder either, but I try to keep my fat/carb/protein ratio in a roughly 40/30/30 area, so adding protein here and eating less carbs with my other meals evens it out.
and agree with rice milk aftertaste. I didn't like coconut milk with this particular smoothie either, but it's usually delicious.