You could get the Bernina walking foot. It behaves like the IDF on Pfaff. The BSR works wonders for FMQ and keeps tension even. I have an Activa 240 that does FMQ like a dream, however.
Bernina machines are sturdy--minimal plastic, BUT the feet
costs are high, unless you shop used.
I don't know alot about Janome, but hear their TOL Quilter's edition is a great machine.