i (and 2 others here) have the Tin Lizzie, the least expensive 18"-er. it doesn't sing and dance, but it has the stitch regulator. it has a wide, deep shelf for pantos, a light, a built-in bobbin winder. if you go to their website, they do sell them used from the factory. it's a family business and they give you phone instruction and trouble-shooting forever. it comes with a 12' table.
http://tinlizzie2.homestead.com/Products2.html
you may have to call them for a price on used. they're very nice and customer oriented. they won't pressure you at all.