But you could probably skip all her releases and just get her Summer Best. Flawless collection.
It's a great collection but it has only 4 of her 20 best songs
Moments
Heaven
Jewel
Is This Love?
Step You
M Fairyland
Carols
Alterna
Rainy Day Inspire
Will
Humming 7/4
Ladies Night
Momentum
End Of The World
Bold & Delicious
About You Fated
Monochrome
Microphone is pretty great too, though the "tell me why tell me why" part is kinda cheese. But hell, the RNR circus album had like...6-7 pretty solid tracks.
More non-trash AKB solo material! Though that part with them showing the viewcounts is impossible because the Japanese labels almost never allow official material online, and if they do, it's seldom available worldwide.
BALLAD, NEXT LEVEL, HANABI, Sparkle, Microphone, rollin', Lady Dynamite, Endless Sorrow, Alterna, Rule, Like a Doll, Marionette, Free & Easy, Last Angel