Not only does the Ellisimo have a 10" throat but it is also 5" from the bed to the top which gives 50 sq. inches. Height is also important.
Depending on your budget, the Janome 6500P has 9" throat and I could quilt full size quilts with no problem. I have never made a quilt larger than that so can't testify about a queen or king but would bet it is doable.