I think the most wonderful sewing machine a quilter can own in the Juki TL-98 (or newer version like 2000-2010). I have owned more expensive and sophisticated machine, but when I bought this one, it was like entering a new world. I never saw or read anywhere any quilter not loving it. It is a workhorse, non-computerized sewing machine (and a straight stitch only, so your wife would keep her older sewing machine for mending, zigzag and such). You don't need class, dealer or anything with this machine, it is easy to use and need no maintenance.
It may seem out of your price range, but if you look on Amazon, they often have warehouse deal for sewing machine with damaged box and such. For exemple, you could buy it for 629$
https://www.amazon.com/JUKI-TL-2000Q...ywords=juki+tl
If your wife doesn't like it, you could always send it back, but I assure you she won't
