You might look at an Ulmer hand quilting frame.
I have a Hinterberg Classic, and I'm very happy with it. It came with two sets of rails, one set is 60 inches, the other is 92. I'm pretty sure Grace Company makes frames that can be enlarged later, too.
If you know someone with a frame, you might want to try quilting on one before you buy. It's different from quilting in a hoop, in that you can't turn the frame like you can a hoop. I learned to quilt away from myself as well as towards myself, and I get great results because the frame is so sturdy. It also keeps the quilt up off the floor and away from curious cats.
Janet