Why do you need a thread cutter on a quilting machine? How would you hide your thread tails as most machines cut the threads too short to hide.
I've had a Juki and found it to be a great machine, it wasn't the sitdown one you're looking at but a regular machine I had stretched to 18 inches to put on a frame. Well made machine in my book. I now have the large 26" Innova on a frame and again no thread cutter but the bobbin is at the front. Again don't know where the bobbin is located on the sitdown version. The Innova machine is another well made machine and their Customer Service is 24/7, 365 days a year. Check with the other machines' Customer Service as in my book that's part of how great the machine itself is.