I have a 15" Bailey, mounted on a Little Gracie II frame. I bought the Bailey used, and it was surprisingly affordable. I just advertised on the Bailey Yahoo Group that I was looking for a used machine, and I was contacted by multiple people. And there are always people on the various Yahoo groups devoted to machine frame quilting who are selling used frames, so you can usually find something for a good price.
I'm pretty happy with my setup -- the Little Gracie II only goes up to queen size, so it doesn't take up a ton of space. It also folds up to take even less space when you're not using it, although I imagine it would be a bit of a pain to do that very often.