Yeah, it's kinda too early for an A BEST
But don't forget A COMPLETE ~ALL SINGLES~
2 
and maybe an
A COMPLETE ~ALL ALBUMS~ since when she released her 1st A BEST, it was just A BEST but when A BEST 2 was released, she also released another compilation album (A COMPLETE, next year but still pretty close) maybe when she'll release A BEST 3 together with other 2 compilation albums (A COMPLETE ~ALL SINGLES~ 2 and A COMPLETE ~ALL ALBUMS~), wouldn't be wonderful?