Okay, here's one that might turn up sooner than the Singers. All metal, free arm, direct drive, and doesn't weigh a ton.
[ATTACH=CONFIG]540625[/ATTACH]
They show up from time to time on the big auction sites and since it's a Japanese machine prices are usually lower than the Singers, but still not cheap. I've mended jeans with mine so I know it can handle thicker fabrics, and the fancy stitches are built in with metal dual cam stacks.
Cari