AoA is the 8 members. AoA Black is the band version so only 5 members that plays instruments. AoA White is the dance version, 7 members (all but the one who play the Drum)
- - - Updated - - -
After listening to what you used to listen, and what you seems to listen now. I would suggest Juniel if you don't already know her.
And Hello Venus in the more recent kpop groups. http://www.youtube.com/watch?v=dyH2O_te-ss