It's really hard to decide. On one hand, you have Libei Fatali coupled with the opening CG of FFVIII which, when viewed, gives me an erection of titanic proportions. Then there's One Winged Angel, with its "dundundununununundnun SEPHIROTH!!!...SEPHIROTH!! donunununnunndundnun SEPHIROTH!!...SEPHIROTH!!". AKA it's damn good. In the end my vote goes to...

FFIX - Black Mage Village Theme