I love my Janome 6600, my pieceing has improved greatly. But it has alot of bells and whistles that you may not need or want. the feet you buy are not expensive either.
You could look into the Juki 98Q, it is a work horse, industrial machine.simple straight stitching..solid,not plastic. 9" throat.and half the price of the 6600.
i would advise you to find a sew and vac dealer, where you can test drive the machines your thinking about. Bring a quilt sandwich with you, and go play with them.