I know alot of people who had big ideas when they bought "top of the line" machines.... and years later little has happened in the way of projects.
First question can you really afford it? Is it a want or need? How much will you really use the new features? What does the machine do that you can not do now , and how much of that will you be doing?
Truth be told I have a few machines and 99 percent of the time I am sewing straight stiches.