One Piece OP 16:
https://www.youtube.com/watch?v=3wSvrBxzX4o
Naruto OP 2:
https://www.youtube.com/watch?feature=player_embedded&v=V_WyCySZOCQ
Hellsing OP:
https://www.youtube.com/watch?v=s9MjaOJSKk8
Other openings I loved are the Fullmetal Alchemist (+Brotherhood) openings, Death Note OP 1 and Monster
Edit: I also quite enjoyed the Persona 4 anime second opening: https://www.youtube.com/watch?v=xODbIjViwdw
PSN ID: clemens-nl