Hmmm...
1) Fullmetal Alchemist
2) BECK
3) Gurren Lagann
4) Digimon (1, 2 + 3)
5) K-On!
6) Soul Eater
7) Darker than Black
8) Eureka Seven
9) Samurai 7
10) Cowboy Bebop

I'm sure Gurren Lagann will jump to the top of this list once I watch the last 12-ish episodes, but that's a rough guide for now.

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