I just traded my Janome 9000 for a used Bernina 450. I have had it only a few days and really like it. I make Quilts of Valor and machine quilt them. The BSR (Bernina Stitch Regulator) is wonderful. The stitches are the same size regardless if my hands go slowly or if I go a bit faster. Regardless, all the same size.
Could not afford a new Bernina. The used one suited my pocketbook. I could not get good service on my Janome and this is a complaint from several other owners of same. Make sure you can get good service that is conveniently located whether you purchase new or used.
Suz