I just recently had this conversation with my husband. My dream machine would be the Brother Quattro 2 with a knee lift like the Bernina, all the feet the Bernina offers, and an automatic walking foot like my Pfaff 7510 for quilting. It's like taking the best technologies from all the manufacturers.
And I also agree with everyone's comments about the never-having-to-refill-a-bobbin.
I can only dream....