I love, love, love my Juki HZL-400. The only thing I wish was that the harp was larger...that and the built in accufeed foot are the only things about my Janome Horizon 7700 that is better.. I mean I do like my 7700.. But I was blown away by how quiet and smooth the Juki is... And it was about a fourth of the price.
Granted if it had an 11" bed, the price would've been a lot more...minor details..lol
I haven't ordered any extra feet for my Juki, so can't help on that.
Enjoy your new machine!
Kif