Not really. I actually use most of the 17 machines I have. And, since we spend 6 months at one house and 6 months at the other I have duplicates so I don't have to move them back and forth. My favorites are:
the FWs for piecing
the 15-91s for quilting
the 127s for binding
the Viking 1+ for mending and zig-zag
But, I really don't need any more at this point.