The hole in the front of the Pfaff would be nice for the 319 - you can reach in and change the bobbin with out having to move the slide plate. Those 319s are a pain to change the bobbin otherwise. Don't forget that machine takes special needles. Here is a link to one I cleaned up:
http://www.quiltingboard.com/picture...c-t162425.html - lots of useful information from other QB members on there.