Anna, if you like free motion work I would suggest Libby Lehman's free motion couching foot #43. She demos in in the video that is available until the end of this month (at minute 56).
You can also see it in the Bernina video: [url]learn/bernina/[/url]
http://www.bernina.com/en-US/Products-us/BERNINA-products-us/BERNINA-Accessories-us/Presser-feet-us/Free-motion-couching-foot-en
Of course, basic feet include the patchwork foot #37, an off-set free motion foot # 9, a walking foot #50, an open-toe applique foot # 20, Pintuck foot for mini piping #30,31 or 32, edgestitch #10 for stitching in the ditch. (The walking foot also now comes with a guide for stitching in the ditch.)
Hope that helps.
Where is the link for the Libby Lehman video... I have a full membership but I have not found it yet. I did not find it in the classroom list ......