Wow! This is a very informative thread. I've recently purchased two older Bernina's, Nova 900 (circa1970) and a 53O (circa 1980). I mention this as a testament to the durability of the Bernina machines. I have friends in my guild who have each of the machines you listed and they are more than satisfied. I learned something important when I bought my last higher function machine. While test driving and learning I decided to focus on two models...one was all the functions I thought I needed and the second was a step up with a two additional features at about $600 more. I bought the lesser cost machine. It has served me well but now my sewing projects have evolved and those extra functions would have been quite usefull. Next time I buy a new machine I will probably stretch a little to get the step up.