I would recommend you buy your dealer! If you have quilt shops close, go visit, shop the people and the machines they have - many have used machines they've taken in on trade.
No machine features will equal what a good dealer can do for you. When I bought a new machine a couple of years ago, I thought I wanted it only for garments and home dec - then I got into embroidery and quilting. Fortunately for me, my dealer has a good trade in program.
You might also ask if they do repairs in house or have to send them out. I called my LQS today with a question about my machine, got the answer over the phone. That's a whole lot better than having to take it to the shop.
Good luck, have fun!