Excellent price on the 9400. I have one that I paid $3000 for about a year ago. I love all of the bells and whistles and because I have other Janomes I can share bobbins, feet, etc. with my other machines. I have very little experience with Berninas, but my cousin purchased a lemon a few years back. It can happen.
The Janome sews great, has all of the features I love, but has one flaw -- when the pressure foot goes up or down, I hear a loud cricket sound. If I have it set to auto lift (absolutely love this option) I hear it more often. The sound did not bother me at all until I took my machine to a guild sew-in and then I worried it would bother my table mate. Now it kind of bugs me. I asked the technician about it when I took it in for it's annual cleaning and she said it was normal for this model.
I wish you the best of luck.