The Pfaff Grand Quilter/Husquavarna Mega Quilter (Basically the same machine) both have a larger throat space, 9.5", and a high stitch rate but is only a straight stitch machine. I had mine on a Gracie II frame and found it very good for free motion quilting and pieceing and is very reasonably priced. Around £500 in the UK last year. I have now bought a Nolting 14" for the frame but still use the other machine for smaller jobs and pieceing. Perhaps a preowned one would be a good starting point.