I travel with a small older model Pfaff. Pre-computer so I can plug it in anywhere and do not need a power bar. It has very basic stitches. It is a durable machine and I love it. You can get older Pfaffs online. If you choose this, be sure it is a model that was made in Germany.
Just remember that if you are doing a project on a certain machine, that it is best to do the whole project on the same one. Even a slight variation in seamlines can make a huge difference on a quilt top.