For a sheerly objective question, here are my 
answers ^_^

Shamanic Princess (sheer eye candy)
Tenshi ni Narumon (-everything- was so glossed 
over!)
Violinist of Hameln (So unique)
Argent Soma (Kirei~)
Mahou Tsukai Tai (...=^.^=...)
Escaflowne (a given)
ANYTHING by Reiji Matusmoto (more specifically 
the most recent Harlock and Emeraldas series'. 
Yes, Tochiro is ugly..but Maetel is gorgeous, no?)
Kamikaze Kaitou Jeanne (Yes, I have a thing for 
Access Time...and Noin...what of it?!)
X (AKA "X/1999"...visual crack)

And there's just something about Lain...i's not 
necciarily pretty, but very aesthetically 
stunning. 

Personally, I think you should make a few cels 
for anime that don't have cels...Like Saiyuki, 
Argent Soma, Kamikaze Kaitou Jeanne, Yami no 
Matsui, Angelic Layer, Megami Kouhosei, Angel 
Sanctuary, etc.

-Misha-chan