Alright, so I know this is a leather sewing forum, but every time I google a potential new sewing machine model number, I end up here, so I figured it'd be a good place to ask.   I've been sewing for a little bit on a singer 'heavy duty', I think I'm sort of getting to the limits of what the machine is capible of (in terms of material thickness/etc, not sewing skill or whatever, obviously). I'm going to be using mostly canvas (15-24oz) but also leather and other heavy materials to make