I have to join the group that believes that the music is kinda off, mostly due to the fact that it isn't a Final Fantasy song. Of course you do have the final word on this (and the trailer is quite well done), but I do dare suggest to use a FFXIV song or, failing that, another FF song.

And here are some personal choices from the FFXIV soundtrack, but it really depends on what type of theme you want for the trailer

http://www.youtube.com/watch?v=OiHA7...08F47C925C651D

http://www.youtube.com/watch?v=EmtRB...25C651D&lf=BFa

http://www.youtube.com/watch?v=boLXZ...25C651D&lf=BFa

http://www.youtube.com/watch?v=WvsTA...25C651D&lf=BFa

(also, funny that these 4 songs aren't used in the game yet)