I'd definitely recommend trying these albums first:
-LOVE & HONESTY
-Atlantis Princess
Girls On Top, the track, is one of my favorites.
Luna62 posted a link for aikawa nanase's discography in a requesats thread, but i noticed it also has BoA's discography, so you could find some of her albums here:
http://nhatkyviet.com/2007/03/04/boa...aphy-updating/