After several years reading advice on this site,... I'm jumping in on this question.  There is a HUGE difference between the Khols 6 QT Kitchenaid, and the Williams Sonoma 7 QT.  Seriously, night and day difference.  Just like you're thinking, I upgraded from the 5 Qt to Khols 6 QT almost three years ago, because of the great coupon discount.  From day one, I was disappointed in the motor power, and kept using my smaller one when I needed a "stronger" mixer.    I was...