I have a 15 a 66 and a 27. I think if I wanted to do lots of sewing I'd choose the 66. The 15 sews ANYTHING and is a great machine. I love my 27 because it was my grandmothers but the long bobbins really don't hold much thread. I'm working on a dresden plate using the 27 but just piecing the fans. When I get down to the serious work, I'll switch to the 15.