d gray man is my favorite manga, but its discontinued at the moment for copyright infringement :/
loveless is pretty good but its a little old...
alice in the country of hearts is a shojo so i doubt youll like that one....
hmm.... chrono cross is good but i hated the ending. and if im not mistaken, gaia shows the anime under.... world tab? forums? :/ one of them.
soul eater was my favorite anime til i saw the last episode (******** bravery -.- pathetic.)
a lot of guys say that hellsing is the best, but i dont see it. same with dmc. the main characters are just marty sues -.- its really dumb.
bizenghast has a pretty good storyline for an american manga
ive heard hitman reborn (what rozu suggested) was really good.
ghost in the shell and the hack series are classics from the 90's.... technically ghost in the shell started in 89 but whatever :/ its still continued so it must be good (unlike that s**t bleach. i despise bleach.)
thats all i can think of right now though :/ sorry