If the only reason you are buying the Bernina is for the BSR, I would definitely call Hinterberg & have a Voyager 17SLR with their stretch frame delivered instead. Same or very close to the same in price-- a lot less if you can get a used one.
Now, the real question is do you want to sit & quilt while you move the fabric or would you be happy standing at the frame and moving the carriage over the quilt? Some folks compare it to moving the paper under a stationary pencil versus moving the pencil over the stationary paper.
My shoulders can't take moving the fabric under the needle so a frame was the only way to go for me. Others are perfectly happy to just piece top after top and use all those pennies they've been saving to pay the local longarmer to quilt.