hellsing [ultimate]
ao no exorcist
^ favorite of that list

elfen lied
fate zero
guilty crown
^enjoyed of that list

accel world
^i'm interested in but haven't watched, yet

DTB
Ghost in the shell
Accel world
Fate series
Ao no exorcist

imo watch elfen lied and highschool of the dead last cause they're not as good as the others.

These 3 I'd watch first.

Bolded are ones worth watching and time well invested. Angel beats/guilty crown/ao no exorcist are just very appealing and likeable.

Angel beats
Accel World
Guilty Crown
Fate Zero
ao no exorcist

those never seen the exorcist one though.

dont even watch highschool of the dead it blows, i couldnt even finish the series and i love Ecchi :/

You should watch all of them, HSOTD is a pretty much a popcorn anime it's enjoyable and doesn't really try to be anything another than it is, the first season of Darker than black is really good the second season is eh, Elfen Lied is like asdfghj but it's still worth the watch, Ghost in Shell, Baccano,Cowboy Bebop, FMA, and Fate Zero are all amazing I highly recommend them.

fma brotherhood
cowboy bebop
baccano
ghost in the shell

Elfen Lied
Cowboy Bebop
FMA Brotherhood