Commercial Smoothie Blenders

about the quality of mixing, time, price and quantity stored.

I recommend you go into business retail smoothie and watching what they have. Talk to a friendly manager that you are thinking about starting a small smoothie place across the city and ask them about their mixers, the advantages and disadvantages.
You will probably find more reliable information than you find with all the "experts" here!

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All I know is the most powerful blenders are a species called VitaMix. They are expensive, but because the blades last forever and they are like 20 hp (or something like that.) So if you're willing to make the investment ...