I second Beast Master.

Akagami no Shirayukihime
Othello.
Akuma to Love Song
Crossroad
Venus Capriccio
Tokyo Crazy Paradise
Nodame Cantabile
Skip Beat!
Boku no Hatsukoi wo Kimi ni Sasagu
H2O
Koukou Debut
Superior

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Lots and lots of blood!

I would recommend:

NANA
Kare Kano
Fruits Basket
Sunadokei
Kare first Love
Fullmoon wo sagashite
(Kodomo no Omocha)
(Marmalade Boy)
Vitamin

For comedy-shojo I would recommend:
Charming Junkie (Nousatsu Junkie)
Gokinjo monogatari

And for sweet but not "deep" stoeries I would recommend:
Love-Berrish!
Aishiteruze Baby
Rockin Heaven

aaand for a little bit smut:
Mitsu x Mitsu drops
Renai Shijo Shugi
Rhapsody in Heaven