Of course, it very much depends on the kind of work you do, but I think it's worth having three back saws. A small one, 8" to 10" long, about 16tpi rip, for dovetail and small joint cutting; a large one, 14" 8tpi or 10tpi rip for larger tenon cheeks; and a medium one, say 12" 12tpi crosscut for...