I have 4
1895 Standard Treadle - my favorite and is used all the time. I do most of my piecing on it
1919 Singer 66 Red Eye Treadle - Picked it up at a yard sale and cleaned it up. It works but may go to a new home if I can find the right one.
1950's Singer 15-91 - used on a regular basis mostly for machine quilting.
1970's Singer 758 Touch N Sew - bought new and is my go to machine when I do machine applique or anything where I need a zig zag stitch.
I wouldn't mind having a featherweight simply for the ability to pack them around easily when I need to and I have no interest in the newer machines. If the right one comes along it will be mine.