GroVia O.N.E.s- how many for my stash?

Kate
I really like the GroVia O.N.E.s after months of research for the best cloth diapers for my family. I'm curious if any of you have them or a similar cloth diaper, how many you recommend for a stash? I plan to wash every 2-3 days and use these exclusively for day and night (I plan to get extra bamboo inserts for at night if my baby turns out to be a heavy wetter). I am a minimalist so I'd like to not go crazy with my stash, but still have enough to get me through.