I agree about going to a large quilt show. I went to the Cincinnati show and tried every machine and frame. I stood around and listened as others did too and listened as some who had those machines told about theirs and their experiences. Then I went back a second day and did the same thing. I gave the frames a good shake and watched as they worked with them. I found out what kind of support their company had and what kind of classes.
I ended up buying a Baby Lock Crown Jewel with a Majestic frame. I got a deal on the 4 day class in St. Louis with Kay Capps Cross using a machine just like the one I bought. I am sure I would not have been so comfortable using my machine without it. The information and education is critical.
I wish you well. You seem to be well on your way to carefully choosing.