Normally, I would vote for Bernina, but for me as a long time Bernina owner I would not pay that price. There are many great machines out there that are just as good as Bernina. The main thing is sit down and try them. Do you have a quilt show coming up anytime soon, it is a great place to try machines. The Pfaffs are just as good a Berninas. But of course this is just my opinion. There are also some great Berninas, not as pricy as the 830.
Good luck.