Well...still looking through for some techno (any particular artist you could recommend?) right now I've looked around a bit more...right now I'm debating between
Sandstorm (Darude, general action clips)
Men Of Destiny (Amuro vs Char duel...Yeah, it's from another Gundam, but honestly it seems to fit Char and Amuro better than Kou and Gato)
Into the Trap; Fight in the Dungeon (John Williams, Return of the Jedi OST, set to the Axis Battle)
Think they could work?