Check out the depth of the throat. Bailey is 17 inches, if the Grace GMQ is shorter, skip it. You would out grow it very fast.
The thing with the throat space is: When you roll the quilt it takes up space in the 'throat' of the machine which in turn makes a smaller area you can quilt.
I use a domestic machine on a table top frame. When I get to the end of the quilt I only have 1.5 inches of quilting space, but when I start I have about 3.5 inches. That is what gets all of us quilters....