Favourites?
Um...
In no particlar order:

First Love, Automatic, DISTANCE, Drama, SAKURA DROPS, Kettobase!, HEART STATION, Take 5, Kiss & Cry, Letters, TOKYO NIGHTS, A.S.A.P., FINAL DISTANCE, WINGS, COLORS, Be My Last, Stay Gold, Dareka no Negai ga Kanau Koro, Kairo, Passion, Hikari, This is Love, Making Love, BLUE, Merry Christmas Mr. Lawrence - FYI, This One (Crying Like a Child), Me Muero, On and On, Dirty Desire, Taking My Money Back, Poppin', Apple and Cinnamon, Come Back to Me
I also love ALL the tracks on EXODUS.

To name a few.. :)