Gosh, how old were these Berninas when the motherboard died? Several of you have mentioned this. I live in fear that my motherboard on my Pfaff 7570 (or some other essential part) will die and I won't be able to get parts for it.
I also have a old Kenmore, and I definitely would use that while you make a decision on your Bernina. Good luck. A good sewing machine is a "diamond" that we cherish and never want to loose.