Our daughter recently moved to Amsterdam, so we will be visiting twice this year and probably once or twice a year as long as she stays there. For our March trip, we will spend a total of one week in Amsterdam, and a few days in Leiden, Den Haag, and Utrecht; when we return in June we have 6 days in Amsterdam but will likely do some day trips, perhaps to Enkhuizen or the Open-Air museum near Arnhem.
I know Rick recommends TripKey as a simpler option, but I'd like to hang onto the card for future use and that doesn't seem like an option with TripKey. (I still have my Oyster card from years ago, which worked perfectly on our recent trip, as well as our 2011 cards for the Tokyo subway system...) So I am leaning towards getting the OV-Chipkaart - perhaps the personal one for myself and the anonymous for my husband, so he can hand it off to my sister who will visit with me in June. I'd appreciate any suggestions or advice!