i know it's been a while since you asked, but...
i am an NW20 (i wear the Medium MSF if that helsp as well) and i am currently wearing the Light Everday Minerals. I also have a jar of Medium Beige that i use as a sort of bronzer or when i get tanned.
i just got the entire starter kit and it comes with Finishing dust which i do use every day. it helps the staying power.