I have the Singer 403A which I inherited from the husbands grandmother. It is all metal, and I do love working with an all metal machine. I will admit, my biggest concern is something breaking, and not being able to find replacement parts, but I have been able to find all the accessories I wanted on ebay. The machine came witht he cams and the manual so I started off pretty well. I have seen my same machine go for around $300 on ebay.
If you have any questions, feel free to pm me.