I have the Smoothie Elite, retails for about 40, from Target or Sears. I love it. It's easily cleanable, nice wide mouth, and a good seal on the lid. It's nicely weight distributed so that when you pull forward the dispenser, it doesn't tip forward.
I didn't really think I would use it and it was a Christmas gift, and I've found that I use it at least once or twice a week. It also crushes ice nicely. I've been very impressed with it.
I would only recommend a smoothie maker if you really make smoothies, shakes, or mixed thick drinks. I have a kitchenaid blender which I was using before I got it, and I do like the smoothie machine's consistency better. I'm sure it's just a matter of perception, but I would well recommend one if you think you'll use it.

Hope that helps.