I hope I'm not breaking rules. On my website I've got a page about features that I like on my sewing machine and also have a survey for quilters to give input on what they think is necessary.
I second the thought of visiting the sewing machine dealers. Test drive the machine on things you'd work on with your own fabrics. Not only will you be test driving the possibilities, but also test driving the dealer. Are they helpful? Or was it a nuisance for them to work with you? (Not a good sign, especially if you're ready to spend money!) Did the person helping you understand the workings of the machine...she/he may be the one giving the lessons on the machine. A lot can be learned about not just the machine at these visits.
Good luck to you, hope the information helps!
Julie Baird