Innova also has a sit down machine, as does HQ and Babylock (which are both the same machine branded differently for each). There is also a small mom-and-pop business called Pennywinkle that makes a sit down as well (I believe they have a pretty good reputation so don't let "small mom-and-pop" sway you).
I've test drove a few of them, and like all sewing machines and long arms - they all "feel" different. The one *I* like may not be the one *you* like.
You really should get yourself to a large quilting show and test drive as many as you can. Narrow it down by "I like the way these machines felt" first, then sort them by (in no particular order): price, dealership availability/proximity, warranty, manufacturer support.