C.C.
We repair Vitamix blenders for one of our commercial customers (a smoothie chain). The only way a Vitamix is quiet (and even then, it's not quiet), is if you get the type that can be encased in the clear plastic shroud. That dampens the sound somewhat, but it's not going to be quiet if you're blending anything hard (like ice cubes). Part of what makes a good blender a good blender is its speed and power - and you have to sacrifice sound for those two things.
That being said, even though we have many, many Vitamix blenders sitting fully repaired in our shop, we have a Ninja on our kitchen countertop. For the price, you can't beat it, in my opinion.