First of all, I would add Innova and put it at the top of the list.
I've taken classes at quilt shows on the Gammill Vision and did not like the way it handled. The older Gammills were better machines IMHO. I've also had classes on HandiQuilter (I think it was the Avante), and I was happy with the way it handled. That would probably be my second choice.
Some people are very concerned about having a longarm dealer nearby. I've never found that to be a problem. Innova 24/7 phone support is so good that I have been able to fix any and all problems without having a technician look at the machine. The only exception was when I chose to have the machine upgraded with lightning stitch, and then I took the machine head to a dealer. I've been able to do all other maintenance and upgrades myself.