Probably too late to help you in this but I just wanted to add this: I bought 2 portable Singer Touch'N Sew on Ebay for peanuts considering the price I paid 25 years ago! But these machines work so well, my two daughters-in-law wanted to learn sewing so I will be able to teach them on these machines. The TNS has all the important features mentioned and on Ebay, I can buy also my bobbins for so much less than at the Singer store.
All I did upon reception of the machines was to have them checked by the Singer technician and now, both are working wonderfully.