I would do my homework before I purchased a long arm. I had a smaller system with a B-line frame and a JukiTL98Q and then upgraded to a used HQ16. It was a sit down model that I put on the trolley of the B-line. It was a good system, but I was ready to move up to a true long arm. I searched for about 6 months and found a used one local to me. It fit my budget and no shipping. I think the B-line frame was good for me. I learned how to troubleshoot, that long arming is a PROCESS..and that I would not be able to just do award winning quilting right out of the chute. I have had my Gammill for 2 years and just starting to quilt for others.
Test drive all the machines you can get your hands on. Ask around on this board to find a long armer that does the kind of quilting you are looking for. Good luck!