They are wanting nearly new price for the Juki combo and the Grace wooden frames can't touch the Hinty Stretch.
The Voyager with frame is a much better deal. I have the Voyager 17 with stitch regulator but mine is on a Pro-Flex frame--similar to the Hinty Stretch. I got mine on ebay for a song because it was poorly described. They are very easy to work on yourself but be aware it is very heavy--very! 75 pounds. It will move like a hot knife through butter though if your frame is level.
The Hinty Stretch (and my Pro-Flex) frame uses pipes (EMT conduit) for the machine to ride around on and for the fabric bars/rollers. The pipe comes in 10' sections available at any hardware store. Commercial electrical contractors might be able to get longer lengths. If you don't need or have room for the 10' poles, you can cut them down.