Which packages of Gapps can't be downloaded through the Play Store/marketplace?

I've seen that there are quite many different modular packages of the Gapps http://forum.xda-developers.com/showthread.php?t=2397942 and I was wondering if I can install the nano and add the other Gapps one by one through the Play Store. Or if there by chance some Google apps that can't be retrieved with the Play Store? I'd like to start with a very minimal set of apps if possible (and not to install Google Now).