This one's for you nailz,
I thought about using them for something, and I think they would be fantastic to hear, but for an AMV ... they fall too close to Dream Theater in terms of song length. But here are a few Ideas I had:
Accolade II - Berserk : Makes perfect sense with the character of Guts. I love the melody but it is just too long. Would need to edit.
On the Breath of Poseidon - Banner/Battle Flag of the Stars : Very orchestral piece and very complete (has a beginning and an end). The theatrical tone of it makes me feel like I am watching a movie trailer and the only 'epic' anime I know that would fit is, well. Also it would not be a music video per se but more like a trailer, cutting in pieces of text. It could be cool.
Prelude (from V: The New Mythology Suite) - Devil Lady : It's very short but the sound almost seems to come right out of that series and it happens to be one I am really into now. Again this would be more like a trailer rather than a MV, but it could still work.
----
That's really all I could come up with. Doubtful I would every make any of them, but maybe someone else could take up the burden.

