I love my 6600! I have had it for just about a year now. She will be going in for yearly maintence soon. My only complaint about her is she leaves a little nest at every start--this issue will be addressed when I bring her in. Other than that she is fantastic. My 6600 came with an attachment to extend the surface to make FMQ easy, quilt just slides over it and there are pleny of fancy stitches.
Enjoy your shopping I am sure you will get plenty of opinions here.