I have a Bernina 430, with the BSR. If I had to do it over again, I would not get the BSR. It didn't help that much, and I found the results with my open toe stippling foot to be virtually the same as the results with the BSR.
Your Bernina should do just fine with FMQ. I used my 430 for the first time in a long time recently, and I'd forgotten how quiet and well-behaved it is while quilting. My previous machine broke needles like they were going out of style, and it's a pleasure to be able to sit and sew without waiting for something bad to happen.
Janet