Dakishimeraretara - made me cry the first time I heard it, the song is really close to my heart
Higurashi no Koi - too awesome for words because it was sang by two of the best singers in AKB
Shinkirou - ah, my favorite Rina song ever, makes me remember her every time I hear it

Sakura iro no Sora no shita de - this made me cry a lot too, I even liked it more than Junen.
and yeah, there are still a lot of good ballads not on the list. Like:
Dakedo.. - first AKB ballad I ever liked, I love it more than Aitakatta!
Kioku no Dillema - doesn't really come out as a ballad for some people, but the song is really sad.
Classmate - one of the few songs from A1 that I liked, Aki-p just loves songs about kataomoi lol
there's still a lot more, but for SKE's Tooku ni ite mo is special to me. Its just bitter sweet. its THE Team S ballad. Would definitely remind me of the original Team S after all the graduations.
