I have the SQ9050. It comes with 8 feet including a walking, free motion and 1/4". It has an auto threader, needle stays down so you can pivot, the feed dogs can be up or down and on the machine speed control as well as foot control. I've used it to piece blocks, I've quilted 3 quilts and made a runner. One of the quilts (twin size) had double battling. I've have no issues using the machine nor with the machine. I spent $200 and the machine has more bells and whistles than I know what to do with. Until I need more or it stops doing what I need the machine to do, I'm good. Is it a bernia? No, but it works.
I don't know what the other machine features are or what would justify the additional $200. I would not need them at this time. You are asking will you need them? Depends on what features you are particularity looking for. From what you listed as making, the SQ9050 will handle all that.