You mentioned a Juki longarm. However, with most longarms, you are best off purchasing the machine and the frame together. I wouldn't try putting a Juki machine on an Inspira frame. I also wouldn't necessarily recommend a Juki longarm, as they haven't been in the longarm business long and reviews of them so far aren't very good. Click on "search" near the top right of the screen to search the quilting board for comments about the Juki longarm.
For an Inspira frame, you probably want to be looking for a fairly lightweight machine. The BlockRockit is a relatively inexpensive longarm that doesn't weigh too much.