I can't pick just one....there are too many I love for different reasons :x
But here are the ones I love the most:
Get Backers
Samurai Deeper Kyo
Neon Genesis Evangelion
Outlaw Star
Trigun
Hellsing
Dead Leaves
Chobits
Midori no Hibi
Sailor Moon...(ah...the nostalgia is creeping up on me again)
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sorry got bored.