#9 KADO: The Right Answer OP
Tabiuta - M.A.O.
An epic song accompanied by some beautiful visuals.

#8 .hack//SIGN OP
Obsession - See-Saw
The music hooked me into this series, okay? XD And that means the opener did its job.

#7 UN-GO ED
Fantasy - LAMA
Super-catchy closer with some creative visuals.