I have no idea how to decide so I guess my list grows a little longer
Basking shark - a torpedo with a jet engine mounted up front - just looks outlandish eventhough ofcourse nothing much is going on with that species.
Whale shark - just awsome and beautiful
GW - sure impressive!
... and I like "Fast as a shark" by Accept :}
I definately have to agree with the whale shark. Another close to my heart is the lemon shark.