Ladies - thank you all for your advice! I took a lot of your comments on board and I went out today and bought the Pfaff Quilt Expression 4.0!
I gave it a good test run with piecing, appliqué and even a little FMQ and was very pleased with it. This brings my total number of machines to two!
It honestly never entered my head what I would do if my Janome broke down (I'll be keeping it to take to class) and the comment about how one machine can't do everything was very apt.
Once again you ladies have given me great advice - thanks to everyone.