I've mentioned this elsewhere, but I originally bought a Juki with a 9" throat (basically the twin of this Janome), and personally, I found it far too limiting. If you're working mostly with crib-sized quilts, then maybe it would work okay for you, but as soon as you get any quilt of a decent size on the frame, the amount of throat space you have to work with after you've rolled the quilt up will be very limited. The size of the pattern you'll be able to work with will be very small; some people are happy with that, but I certainly wasn't.
I highly recommend looking into getting a used Bailey. You can find one for approximately the same price (with a frame) on the Bailey user group on Yahoo Groups, and get a substantially larger throat! There's someone on there right now, in East Texas, selling their 15" and GMQ Pro frame for $2000, just as a heads up (Once you're a member of the group, go to Database->For Sale or Wanted to see what people are selling). The machine in question doesn't appear to come with a stitch regulator, so that would be an extra expense, but that's still a pretty darn good deal.