The Megaquilter 9", the Pfaff Grandquilter, and the Janome 1600P are all the same machine and are all made by Janome -- excellent build quality, very heavy duty, high-speed near-industrial machines.
Interesting -I've wondered about going down the Janome 1600P route, rather than the 6600 or Horizon, as what I'm primarily looking for is a machine for FMQ.