Full Metal Alchemist is really good
but i haven't watched it all yet >_<
Hmm... i'm too indecisive to decide on the order but, top10:
Full Metal Alchemist
Full Metal Panic (which has 3 seasons, 1st is comedy/action/romance/mecha, the second is kinda a spin-off comedy thing and the third (that just finished airing in japan) is a proper sequel).
Cowboy Bebop (um.. action.. and stuff. bebop rocks
One Piece (>Naruto! comedy)
Last Exile (action/sci-fi, really good animation too)
Neon Genesis Evangelion (mecha/crazyness)
Serial Experiments Lain (supposedly drama/sci-fi.. but this anime is really.. weird)
Elfen Lied (action/horror)
- The first ep probably makes this seem really, um, "cheap"? Within the first few minutes you have some naked girl slaughtering tons of people with psychic powers or something.. but, this anime is really, really good, if you can take the violence + gore (and don't mind the nakedness O.o). I don't think it's for everyone though..
Full Metal Panic is probably my favourite series overall, for now
(and it has nothing to do with FMA, despite the similar name)
I'll probably change my mind on that list though lol. At the moment i've started watching Witch Hunter Robin & Escaflowne... and i'm gonna watch Princess Mononoke soon (i seem to be the only one who hasn't watched Miyazaki's films... though i did recently watch Howl
I want to see Kenshin / Hellsing / Get Backers too..
A couple people have named off Neon Genesis Evangeleon. I heard that they either redid the ending or they're going to. I have avoided watching it because my brother told me that the ending is depressing.
The ending makes very little sense. They did a movie (The End of Evangelion) to replace the last two eps of the series, because you probably need a degree in psychology to understand them O.o
The movie though, is kinda depressing... you should still watch Eva though.