I have a Pfaff Expression 2.0 and I love it. I got it when I first started quilting 4...or is it 5??...years ago. I love the built in walking foot and the wide throat. I was such a beginner when I got it I didn't realize how important those two things would be. But I have no complaints about my Pfaff. Oh, I also like how you can't put the bobbin in wrong. I have been sewing (not quilting) for 50 years and I always had trouble remembering which way the bobbin went in.
But....you need to try the machines out first...test drive like was said earlier. I went with a piece of my own fabric and tried machines in three shops. I already had what I thought was a very good machine, but my husband wanted me to have a new machine for Christmas that year.
There are a lot of stitches I don't use, but who knows, I might someday.
Dina