I have a Bernina 230 that I purchased used from our local Bernina Dealer. I have had it for two years and love it. It is not my main machine (I have another Bernina that I use majority of the time) but I do use it often as does my 10 year old daughter. I also carry it for any classes I take. I think it has an incredible stitch quality. I haven't even had it serviced yet...and it still yields an excellent stitch.
My Bernina dealer said her husband pieces quilts and out of all the choices he has at her shop he always picks the 230. That speaks volumes to me.
Try to determine which machines have the best dealers in your area. That would drive my decision.
Cindy
www.sew-blessed.blogspot.com