If you sew garments, you'll want a #10, the edge stitch foot. I use it all the time! For other feet, it really depends on what you sew. If you only do quilting, you'll want the feet you have and a walking foot. Get the real Bernina walking foot, not an imitation. It is expensive but works extremely well. I've been using mine for almost 20 years and it still keeps things humming. If you do garment or home dec sewing, there is a whole collection of feet you might want - zippers, binding, pintucks, flat fell, bulky overlock, etc. You probably know which ones you would use.
Pam