Great machines one and all
My favorite has to be the 500 series, because that's what my grandmother had when I was growing up. Could have been anything between a 516 and a 560, but I like to think it was a 519 for the year I was born.
On a related note, is it still possible to get a cord with the round plug for the pre-516 models? I have a nice 511 I'd like to find an original-styel cord for.