Let's see
I'd recommend both Full Metal Alchemist And Full Metal Alchemist Brotherhood (both are the same at the beginning but are different at the end. Brotherhood follows the manga)
Cowboy Bebop, Trigun, Neon Genesis Evangelion, Rahxephon, Kenshin, Ouran High School Host Club, Mystical Magical Detective Loki Ragnarok, Chobits, .Hack/sign, Wolf's Rain, Gundam Wing, Death Note, Kaleido Star (season 1 and 2), Princess Tutu, Petite Princess Yucie, Pretear, FLCL, Brigadoon (japanese subs only), Tenchi Muyo Universe/OVA, Outlaw Star, Witch Hunter Robin, Basilisk etc;
Hope this list helps a lot =P