If I were buying a new machine for quilting, I would look at a machine that has a larger throat space, needle up/down, and good lighting. There are other features that can be important but those are my top 3 these days.
Not sure why you picked Singer but there are so many other brands on the market that I would go out on a hunt. Also - I find it very important to test-drive the heck out of these machines because you want to be on a honeymoon for a long time.
My personal experience with Singer wasn't all that great. The one I checked on sounded great on paper but really didn't work well out of the box. Other people on the board are perfectly happy with their Singer. So you never know.