Here I go again.....but at least check out the Bailey Quilting machines. They make both 13 inch and 15 inch machines. I have the 13 and quite pleased. My frame is the GMQ Pro and I have it set up for a Queen size quilt. That will take 104 inches of quilt. I don't plan to do the King size. But can add the extension if needed.
http://www.baileyssewingcenter.com/homequilter.html
I bought package #4 and am very pleased with it.
Send me a PM if you have specific questions.