When it comes to buying a blender and that too a commercial you have a lot of options. But if quality is what you look for then its probably best to go for the below 4:

Blendtec

Vitamix

Hamilton Beach

Ninja

Out of these we at comm kitchens highly recommend you get Blendtec since it is the most reliable blender in the world. Here’s a cool video of the Chef Blender blending awesome stuff: