I have been shopping around for a vitamix, and am struggling with finding a good comparison chart of all the models. Costco sells the 5200 with two pitchers for $500 and the 6300 with one pitcher for approximately the same price. My brother bought the new 750- but I don't seem much difference between that and the cheaper 6300, except pitcher shape/size. There are so many models with minor differences Is there truly much difference in performance or ease of removing food, cleaning between a $400 model and a $650 model? How important/useful are the presets? What do you have and love? What do you use your vitamix for, besides the obvious smoothies? I appreciate any recommendations!