My daughter bought one of the cheaper Singers at Walmart and it's been nothing but trouble. Personally, I think they're a waste of money.
I have been buying used machines from the Goodwill website to donate to my church's charity quilting group. Those machines made in the 70s-80s are not computerized and will last you forever! The dozen or so I've bought have been fabulous machines. I especially look for White machines as they seem to sew the best.