I think for a domestic Juki such as yours you might want to consider a tabletop frame such as Ken Lund's. He has a lot of videos on YouTube, plus there are some QB members have posted photos and information about this type of setup (just put ken lund into search box above). Later on, if you ever decide to upgrade to a midarm or longarm machine, it's best to buy the frame with the machine. Most midarms and longarms work best on the frame for which they were designed, and some machine/frames are not compatible with each other.
For example, I have a midarm Voyager 17 (basically a stretched industrial Singer). This is a heavy machine, and the only frame that can handle its weight well is the Hinterberg stretch frame. If I were to upgrade to an Innova machine, though, I would definitely want an Innova frame; I wouldn't even want to try to use it on a Hinterberg frame. Also, domestic machines with 9" harps do not require the larger carriage needed for midarm and longarm machines.