Heh. So you mentioned GochiUsa is the complete journey to moe. I danno... Aikatsu which I'm totally addicted to goes back to the roots of moe to where it originated from - aka shojo. It has the same sort of moe feeling stuff like Cardcaptors, Full Moon wo sagashite etc. does.
That season 2 ED doesn't include the four high school girls though, just the three middle school girls of which two were pretty minor characters in season one. So the season one OP might be a more accurate indication of general cuteness level: https://www.youtube.com/watch?v=Z2ntCDpXJzE
My favourite is probably Chiya, who is essentially the Chitanda of the group (same seiyuu even).