The "QE" at the end of a Bernina machine number, means is has embroidery capabilities. Keep this in mind when looking at machines and determine if you want to embroider. If you plan to free-motion quilt, I suggested you get one with the BRS capabilities.
I traded a Janome when I got my first Bernina, a 450 (used), traded up to a 730QE (used) and eventually to the 830QE (used). I was primarily interested in a machine with the BSR. I recently purchased another used machine, the Artista 200 which also does embroidery as a backup machine and one that goes easily to class.
These are quality machines and highly recommend them. Our dealer is either #1 or #2 in sales volume in the country. Therefore, he has used machines and offers great service. Service should be high on your requirement list. You will not go wrong with a Bernina. Let us know which one you purchase.