I would keep my vintage Pfaff 130. I use it mainly for applique because of its ability to do zigzag for applique, but lately I've been also using it for some piecing and for my FMQ and ruler quilting too. It's not a treadle, which is its downfall in regards to doomsdays, but my hubby is an electrician so I'm sure he could rig something up.
I do have a treadle, so if I was allowed to keep two, the treadle would be my second.