I also had a Brother CS6000i and wanted to upgrade. And I also wanted to get it from Amazon. I narrowed it down to a Singer Futura and a Brother PE770. Well, buying from Amazon doesn't always give you a description that includes all of the nuances of the machine. I ended up buying the Singer Futura. I liked the size of the harp and that it had 2 embroidery hoops and I wanted to get into some machine embroidery. I only sew lightly and for myself and quilt.
Well, the biggest nuance that I didn't think about was how easily the foot plate came off on my Brother CS6000i. Just pops in and out. The Singer has 2 screws that have to be unscrewed to get the foot plate off to clean. I'll never forget to think about that if I buy another machine.
So, make sure all of the convenient little nuances and nasty dislikes you have about sewing and your machine when you decide on the final choice.