Sure, you can choose a lower end blender to make your Doctor Oz Green Drinks, but if you're concerned about your health, you'll want the best bang for your nutritional buck.
Lower end blenders are gonna burn out pretty quickly trying to shred through greens every day. Worse yet, they aren't able to break open the cell walls of the greens in the same way that the best green smoothie blenders can. Meaning: with a low end blender you're not going to get the same nutritional benefit that these powerhouse blenders provide.
When you're ready to take things to the next level, there are really only two choices if you want to make the best green smoothies:
Truly there is no one best blender for green smoothies. Whether you invest in a Vitamix or a Blendtec, you're making a clear investment in your health with a blender that's going to be with you for ages.
Both blenders cost roughly the same amount of money, so the choice of which blender to pick will come down to which one you personally prefer.
Soon we'll be putting up some one-to-one comparisons of the Blendtec vs Vitamix. Until then, you can't go wrong buying either one of these wonderful blenders.