I've also got the 830. But, if I were to get a long arm set up, I'd go with a different machine than the 820. I'd get an Innova which would cost a bit more, but I think would make you happier. I don't know if an Innova or the ones you've mentioned would work on the Bernina frame. You'd have to ask. But, although I love my 830, I would go the more industrial route and get a true long-arm. If the frame is what's making your decision for you, I'd say consider selling it and buying a complete long-arm set-up. I wouldn't want the frame to limit my decision about buying a longarm. Good luck.