I love my older Bernina 1230, but I would not buy a new 830. It costs way too much money. I'd rather use less money to buy separate machines, each of which does a really good job -- e.g., a Sweet Sixteen or other sitdown machine with wide throat for quilting (if I didn't want to do frame quilting) and a separate embroidery machine with the largest hoop I would want to use. If I didn't have my Bernina 1230, I would probably get a Juki 2010 for piecing and perhaps a Janome for fancy stitches.
My point of view is that a single machine that can do everything is going to be very complicated, which means it is likely to need more maintenance and/or break down more frequently, and it is also likely to not be able to perform each function as well as a machine specifically designed for that function. Also, it's putting all my $ eggs in one basket. What to do if I don't like the machine down the line? Because it's so expensive, it's harder to sell used because fewer people can afford the cash.