I'd go for the blender. if you make smoothies you can vary more with ingredients than you could with a juicer. my smoothie philosophy is that as long as there is more of one ingredient (berries, banana, apple, etc.) than the others, you're safe.
I stopped using my juicer because of the cleanup issues mentioned by someone here. Also, I felt that I didn't get enough juice out of the veggies (carrots, for instance).
Thanks, plus I already have a kick ass blender.
