I would say you might like Yuki Kajiura (Current band she leads is Fiction Junction.)

She's done the following animes:
Noir
.hack//sign (liminality and other anime series of the .hack// franchise)
Xenosaga 2 and 3 games
Sword Art Online
Puella Magica Madoka (Sp?)
Aquarian Age

And a lot more I can't list atm.

Songs that will get you into her music are:
The World
Awakening (.hack//sign version or Aquarian Age version)
Nowhere
Zodiac Sign
Canta Per Me
Fatal Fight
Liminality
Jr

If I go on any longer you'll have WAY too much to look at lol! Enjoy~!