Fullmetal Alchemist:
They never touched 'eastern' alchemy, which western alchemy was based on loosely. And that could be Ed and Al's way home, where Ed should be made to suffer a lot to win Winnry back. To be honest, I could probably write a whole fan fic on this.
Ghost in the Shell: There doesn't need to be a reason for this, it just rocks.
Project A-ko: No spoiler, I just think this has a lot more lampoon material and it's audience has grown enough to appreciate a more mature story now.
Bubblegum Crisis: Had potential, but the writing was a bit wobbly. And I'm sure there's more dark future to be told in that storyline.