I have an old non-computer Bernina 1030 that I love.
I also have a Jem Platinum that I also love - got it for just under $400. It has a walking foot so you can quilt on it. It is semi-computerized, whatever that means.
I really like 2 features 1. a needle down button and 2. the regular foot has a bar attached that keeps one sewing at 1/4" seam allowance.
I recommend it without reservation.
The Jem Gold is cheaper, no computer features but does have 1/4" bar.
Good luck.