I just went through this process. Was at Road to CA (big quilt show). The class I was taking used the Sweet 16. I spent 45 minutes with a dealer and then 6 hours in the quilting techniques for landscape quilts class. That was a great way to figure out if I liked the machine. I did. The dealers were great. When I let them know it was beyond my price reach one of the dealers put me in touch with a woman who was selling a low use 16. He didn't make a commission off of it, although he did do a service on it, before I picked it up. I saved about $2000 off of the price. Got a vetted machine with a few extras on it. I didn't like the stitch regulator when I tried it at the dealers booth. We didn't have that in the class.
I also liked the George. It felt good. It was more expensive than the 16.
I hadn't heard good things about the block rocket and they had young men for salesmen and I bet they had never quilted in their life so I skipped that booth.
If I hadn't been satisfied with what I had I would've looked at Innova.