This may come across as odd but I like the 206/306/319 series just for their looks. If they're in really good shape, they make quite a statement in a cabinet. I have a 306K and a 319W and while noisier than some other machines, they sew beautifully. The embroidery stitches they do are as good if not better than most machines I own including some really great Kenmores (and coming from me, that's a ringing endorsement). The correct needles can still be purchased but they're getting more expensive and more difficult to find, as they're only made in 2 sizes now.
Here are mine. They're not in perfect shape but I like them and like how they sew.
And I agree with Candace that depending upon the price, the feet and attachments and the table might make the machine negligible when considering the total purchase.