Hers a web site you might want to visit.
Quilting with Machines (QwM) October 18-20, 2007 Columbiana, OH
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There is also a quilt show in Nashville next month. A lot of vendors will be there with their respective machine quilting systems. Keep in mind that the National Quilters Association is in Columbus. They have an annual quilt show with all the vendors also.
Gammil, APQS and a few other dealers might have used systems available. Altough they will cost in the thousands. These are the high end machine quilting frames.
Yahoo has a few news groups about machine quilting frames. There is HInterberg, of course, Home quilting Systems and Mindy Casperson has one. She is moving to Pennsylvania from Maryland and setting up her shop. She is a great teacher and conducts classes or will in her new shop when it is finished.
Don't you have the Mega Quilter or something similar. There are groups on Yahoo for the Brother 1500S, Mega Quilter, Juki and darn if I can think of the others right now. But these groups also talk about machine quilting on or off the frames.
As for the home quilting systems there are: Hinterberg, Grace Company, Periwinkle, B-Line, Inspira, New Generation, John Watts just to name a few.
Of course there are the table models of home quilting systems, but I've always thought they were to flimzy so didn't even consider them when I went in search of my system.
The majority of these systems can be set up at 10 feet. Keep in mind the width and depth of the frame and consider just where you will want to set it up.
Have fun researching.
Kate