I agree with Sharon B. I would certainly want to be able to choose the machine and not have my children choose it for me. What a lovely gift to give your mom!
I am a Bernina owner as well as a Babylock Ellageo. For quilting, Bernina is it! However, they are not cheap.
May I suggest you give your mother a nice card and the $ so she can choose it herself? Maybe one or two of you can make a day of machine shopping with her and have lunch together? I know that would do it for me!
Good luck!
Tensi