I have Singer S18, which I love, but more importantly for you is the features that you want to look at in whatever machine you end up with.
I think the needle down feature is very important. The thread cutter and speed control too. I really like that my machine has a knee control. Pay close attention to the amount of light the machine throws on your work. Be sure it comes with an extension table.
My machine came with a foot for FMQ and a walking foot along with a bunch of others. Check to be sure you are getting all the right accessories included. Try to get them to throw in a non-hopping foot if you plan to do any FMQ-ing.
The size of the harp is really important... Mine has a 9" harp and I have no trouble doing a queen size FMQ.
Another important thing is that you have a dealer who is willing to give you lessons and help as you learn the machine.
Check out a bunch of machines and see which you like.
Watson