I have a Janome Sewist 521 and I love it. I haven't really gotten into FMQ yet. Just starting out. If you are a more experienced quilter and have done FMQ, I would get a really good Janome based on what your budget allows. I would also suggest getting one with lots of feet and attachments. or just buy them at the same time. That is one thing that I am lacking is attachments. I hope that this helps.
I would get one that is "better" than mine.