Spring, if you just want to make smoothies with a blender, I don't think you need to spend several hundred dollars on a Vitamix - as nice as it might be.
And I agree with Saria, I had an Oster brand I bought at Walmart and it worked like a champ. I liked it much better than my KitchenAid. After I lost the Oster in the Great Earthquake of 2011, I replaced it with a Breville
blender. I like it a lot. I make smoothies with fruits and veggies and it works great! It was on sale and I had a coupon, so I got it for just over $100 at Bed Bath & Beyond.