If you want to do embroidery, I would take the Ellisimo above any! If you are wanting a machine that is great without spending as much money, the Janome 6500 is a great machine. It doesn't have the dual feed like the 6600 but with a walking foot, it performs the same. If you just want a nice, wide harp machine, look at the Babylock Quilter's Choice or the Symphony which now have a dual feed similar to the Pfaff system. They have a 10 inch harp.
Most important of all is the dealer you buy from! Do you feel comfortable with them?