I love my Janome 8900 QCP. I believe the 9400 is the upgrade version. Both have the 11" throat which is great. That said, keep up your research and test drive. Find the one that fits you best.
Sit down and figure out what you want the machine to do: is it mainly quilting and sewing, do you like embroidery (not all machines can do embroidery (Janome 8900 and 9400 do not). Is the machine staying home or traveling (weight considerations)? How close is the dealer?