well, naturally I'm going to say the Bailey - either the 13 or 15" (I have the 15" with the Little Gracie II frame - $2500)
http://www.baileyssewingcenter.com/bahoqupro15.html
We did a lot of research before deciding on the Bailey - we knew we didn't want a 9" machine - most are way out of reach financially - which makes the Bailey a great deal...
(I have several posts on the picture board concerning my setup (which we just got set up about a week or so ago)